To complain to Universal credit?

[NeedUCAdviceplease]

Morning all,

I'm really upset, frustrated and worried.

I recieve my universal credit on 15th every month.
The statement usually comes out a few days before. This month it said check on 11th July so I checked on Friday, which was 11th and it wasn't there. Thinking it was just delayed, I left it until yesterday (14th) and it still wasn't there but was still saying "your statement will be ready on 11th July, check back then"

I started to worry that I wasn't going to get paid so I called UC at 12:15pm yesterday. I was told that something is blocking my payment, but he can't tell me what, he sent a message to the caseworker and then told me someone will get back to me by 6pm the next day??!!
I started to panic because I have loads of direct debits, including my rent coming out in the morning. He said, don't worry, it probably won't be 6pm, that's just deadline.
I woke up this morning and sicovered I haven't been paid, no information at all showing on my journal. I called again at 8am and was spoken to very snippily and told I would know by 6pm.

Surely this isn't a fair way for them to treat me? No explanation, no payment, no statement, nothing in my to-do list. If I hadn't called, I probably wouldn't know anything about not getting paid today.
Surely they should have told me at the end of the assessment period if there was a problem, instead of leaving me in the lurch like this? I have no shopping money and my landlord is already chasing the rent as its always in his account fist thing.
I really can't wait until 6pm, I have lots I need to do and buy today, I need shopping for dinner tonight.
Should I complain?

Peopld who want to bash benefit claimants need not apply. I am not interested in your judgements, you don't know me or my circumstances, I will not rise to it.

UC mess up 50 percent of my payments and Im told it's our employers reported earnings fault and that it's to do with the date were paid, but they can clearly see its wrong. Never a sorry or any urgency to rectify. It can take me up to 2 to weeks from the date I should have been paid to be paid and almost 3 weeks for my journal reporting the error from the date I logged the error in my journal and days before I get a response from a case worker via my journal from any messages I have left.
Ive had a mixed bag when ringing, ive been spoken to both politely and rudely, but the outcome of ringing is them telling me to put it in a journal,so it's pointless ringing.
I never ever had issue with my working and child tax credits before this transfer and its been a nightmare and stressful worry since I have been with UC. I dread looking at my statements and my stomach turns when I see zero payment. Basically the days I get paid and the strange dates UC ask DWP to provide payments for my husband and I for are sometimes doubled so it looks like weve got double the money coming in for that month. But who to sort this out with and to stop it happening in the future isn't an option when ive asked.

Of course you should complain. As you say your life is planned around a payment. If people weren't paid by work then they would complain. It is pretty common for people have DD the day after pay day. I often write about thinking the UC system is too generous and gives the wrong incentives. But the system is the system and it should pay when it says it will.

Thank you to the last two posters but this is a zombie thread x