help:(

I bought something 400$pp yesterday. when I was logging in today it said all the information I changed the account to was wrong, so the seller must have taken it back! what do I do about this? I've never had to submit a bad claim because i'm so nice It's fucked up this happend to me:/ I have all messages because the trade was done on site. The trade went smoothly. But today it sais the account info is incorrect. WHAT do I do fk?

first off, did you deal onsite or offsite and if it was onsite which user did you deal with?

I'll get it back for you tomorrow bro, fucking idiot partner.

I may be able to assist you with this, was it a Social Media account?