Doctors appointment 'did not attend' on my notes

[Waitingimpatient]

About a year ago I had a gp appt that I had to reschedule but due to miscommunication between the receptionists I ended up with a 'dna' on my notes. Apparently after three you have to leave the surgery. I asked them to take it off, they would not

Yesterday I was meant to have an appt. on Monday I'd received a text reminder (as I always do) and it said 'if you need to cancel text CANCEL to this number' which I did.
I've always phoned before but seeing as they always send these texts (and also ones asking for feedback) I thought I'd do it as was in a rush and it was easier than being on hold on the phone.

I got a shitty phone call today. Apparently I did not attend again. I explained I had replied to the text so I had in fact cancelled as per the instructions in the text to which the receptionist shouted at me "you shouldn't have done that. We don't get the texts you are always meant to phone" wtf??? Why send them then. She then proceeded to tell me one more 'dna' and I have to find another surgery

They can't do this can they? And what is the point of them sending these texts if they are useless.
AIBU to be fuming about this, the way I was spoken to and these two undeserved 'dna' on my notes?

I have occasionally rescheduled the odd appointment. They were generally antenatal ones when I had gone into hospital to have the baby.

I did once miss a hospital antenatal clinic appointment and ultrasound scan because I was upstairs in the delivery unit of the same hospital, where my waters had broken several weeks prematurely. I had asked the staff to call the clinic and explain, but it didn't happen.

I must have been lucky though. A couple of weeks after having my DD3 I got a call from the clinic I should have attended telling me that my records showed what had been happening at the time of the missed appointments, and asking me to just arrange certain blood tests at my post natal checkup. Isn't that the way the system should work if common sense is applied.

DD3 is 13 now, so maybe it was before most of these attempts at automation.