THREE months. Still no refund.

I have now been waiting since Jan 17 and Feb 11 for TWO refunds because they didn't have stock. Contacted them, and was informed that they did try to repay, but that my bank account didn;t work. It has been the same bank account for 20 years. Sent bank account verification 4 weeks ago. Still nothing. Now they came back to ask for my personal bank statements. So they say I am lying, but there own system shows that it has not been refunded. Send me proof of repayment. You are not getting my personal bank statements.