Double payment to The Holiday Club

I have +_ 200 points and I was asked to pay my Annual subs. I activated the " pay " section and was asked to pay via my Credit card - the amount was R 34,381.86. I completed the " pay " box for credit card payments - on entering my details it asked if I wanted to pay - I entered pay and got a message saying that the transaction was rejected - this was on the 14th Oct. 2021. I tried again on 15th Oct. 2021 and the transaction was accepted. On checking my credit card statement I saw that BOTH transactions were approved by my Bankers. I requested my bankers to reverse one of the transactions and was told to first contact the Vendor ( The Holiday Club ) I sent and email to the Holiday club on the morning of 31 Oct. 2021 and had no reply - either via email or telephone. I sent a second email on 4 Nov. 2021 threatening them with action and " surprise Surprise " I received a phone call on the afternoon of the 4th Nov. 2021 saying that a refund request letter was being prepared and would be emailed to me so that I could sign it and send it back. As at 10am on 5h Nov. 2021 not letter has been received by me. In the telephone conversation the Lady said that the refund would take 10 days AFTER they received the refund request letter from me. No interest would be paid whilst they had the double payment. If they delay sending me the " refund request " letter it would mean that the refund could be delayed even further - without any interest. I would like to suggest that other Members of the Holiday Club ( run by the Beekman Group ) check their credit card statements to see if the may also have had the same problem.