Sanlam is messing with me now

I opened a tax free savings with Sanlam at the beginning of the for them to deduct R1500 each month on my bank account. They failed to deduct the amounts I asked them to deduct so at the end of March I requested them to cancel the damn thing and refund me. I received my refund of R1500 on the 24th of April and I thought they had cancelled the TFS account as confirmed on the email they sent me. Yesterday Sanlam deducted R1500 from my bank account again. I want my money ASAP. My TFS account number is ***X1