a guy called me about a debt hes trying to collect on a credit card from 2008. i cant fully remember, but im almost sure i paid that off back in 2009. he said he was collecting for wells fargo.

tried to get me to give him my card/bank information to setup a "post date" payment , checks,money orders etc. not accepted. when i told him i didnt have one that ill have to call him back, he got very rude. and eventually hung up on me while trying to get information from him.

A phone call, email or text message from a supposed debt collector is not legally sufficient evidence of debt.

The Fair Debt Collection Practices Act (FDCPA) includes statements such as this:

* Every collector must send you a written “validation notice” telling you how much money you owe within five days after they first contact you. This notice also must include the name of the creditor to whom you owe the money, and how to proceed if you don’t think you owe the money.   ["Written" means snailmailed ... not emailed or texted]

Source:
https://www.consumer.ftc.gov/articles/0149-debt-collection

Therefore, if that caller wants you to pay immediately, before you get the written validation notice via snailmail, or if the caller wants payment via green dot, Western Union, or other untraceable means, then the call is definitely not legitimate.

IF you wish to communicate with the supposed collector / creditor, visit  the following page, for example "Action Letters" to snailmail:
http://www.consumerfinance.gov/blog/debtcollection/

If you KNOW you owe no money, or believe the call was from a fake debt collector, please take the time to read this:
http://www.consumer.ftc.gov/articles/0258-fake-debt-collectors