If you paid for tech support services, and later receive a call about a refund, this call is probably a scam. Don’t give this person any personal or financial information.
The refund scam works like this: Several months after a purchase, someone calls to ask if you were happy with the service. If you say "No", the scammer offers a refund. Or, the caller says the company is going out of business and giving refunds. The scammer eventually asks for your bank or credit card account number, or asks for access to your bank account to make a deposit. But instead of putting money in your account, the scammer takes money from your account.