Should i be worried about theses messages?

[Hardsell]

I was selling a phone. And had an add up. Someone replied, and how they messaged worried me. It went like this.

Buyer: is this still available? If so will you take 350.

Me:yes I would take 350

Buyer: when can I pick up.

Me: when bis good for you?

Buyer I'm available tomorrow

Me: I'm out tomorrow can you do Monday.

Buyer: monday is fine, what time are you available.

Me: I can do most times . When is good for you.

The above was 2 days ago .

Today.
Buyer: Goodmorning sorry I forgot to say do you mind if we meet above midday.

Buyer: Im preparing to leave.
Buyer hello
Buyer hello
Buyer I'm in the car right now I need your postcode
Buyer sorry for not asking sooner
Buyer now I have to spam you.
Buyer hello
Buyer hello
Buyer hello
Buyer hello
Buyer hello
Buyer; my name
Buyer hello
Buyer my name
Buyer hi
Buyer my name
Buyer hi
Buyer hi
Buyer I need a postcode
Buyer please
Buyer hello
Buyer my name
Buyer hello
Buyer when you see theses messages please call me.

Me: sorry I only just saw theses messages

Buyer; its ok no worries
Buyer sorry fur spamming you
Buyer what time would you like to meet up.

Me: when you say meet up do you mean you want me to meet you somewhere?

Buyer : like in person
Buyer for the phone

I stopped replying at this point because I was worried.

Buyer: like i need your postcode otherwise I can't come.
Buyer: if your free today
Buyer hello

Buyer: Are you wanting to sell the phone or do you want to waste my time, I'm doing you a favour and willing to spend money for it and you can't be bothered to reply..

I stopped replying when I did because it worried me. It wasn't the words so much it was how desperate they seemed

Selling old phones on marketplace is just full of scams! I’m not sure what this one is but if you’re not happy just block

Far too much hassle, block and move on

It's sounds like he's awful at communication and decided that he wanted to pick it up at midday but hadn't asked the address etc.
Did you receive the message about coming at midday before he asked for the address and spammed you? It seems odd you weren't making arrangements for meeting if you had fixed a time.

There wasn't a time fixed. I asked what time was good and there was no reply. For 2 days.

Then this morning I suddenly see all theses messages. Starting with im preparing to leave. But a time hadn't been agreed.