TCF National Bank Bank Account Or Service Complaint

TCF National Bank Bank account or service department,

Checking account Using a debit or ATM card Illinois

i have an account with TCF bank, on -/-/15 I purchased shoes from website, in thein the amount of $170.00, the items were out of stock, so I requested refundon -/-/15, and since then back and forth with this merchant to refund me, finally 10 days ago or more, the merchant stated they refunded me for the full amount, but TCF bank insisting that there is no refund, and they are requesting me to ax them information proving the communication between me and the merchant, I faxedthe info 3 times, and keep saying its not showing received and they are investigating the issue ..I am the victim and they are holding my money, when actually I showed the solid proof that the merchant stating they refunded me and my bank have the moneyto tell you the truth, I do n't know who to believe anymore, its been 2 months ... I gave up ... Please help