Debit order dispute

A debit order for R1270. 00 went off my account in Feb. I tried to dispute online but was told the amount is too high to be disputed online. I thereafter disputed via app and was told I will be charged for dispute. Long story short - We finally managed to reverse the charge at a charge. April I get the same debit order I disputed and canceled in Feb? In quarantine but make contact with them via app chat and I am told FNB cannot reverse debit orders and I need to get in touch with the company that debits my account. I don't have details of that company. The lady from FNB (Kamo) gives me their contact number and email. I tell Kamo that the contact number doesn't work and received no response from the email and she ends the chat. I have a charge that went off my account of which FNB says they cannot reverse and neither can I get the correct details of the company that debits. This is not the first incident or first time I have to go through hell to resolve an issue with FNB. All I want is a refund of the money deducted from my account. I have no interest in anything else