I tried to send buyer my contact information to arrange collection and now i cant send messages at a

[jay-6763]

I tries to send buyer my number at pickup location but now whenever i try to send any message ebay says that my message includes contact information

[**peaseblossom**]

eBay blocks messages containing contact details prior to online payment.    Buyer has to pay first via ebay and then you can exchange details.

Also see "Proof of collection" on here:
https://www.ebay.co.uk/help/selling/posting-items/setting-postage-options/local-collection?id=4181