Money out of my account

So last week and Thursday an amount of R2140.00 was deducted from my back account, Tried to Dispute it but I couldn't, Phone my bank explain them what happen, I was told that I need to contact the people who deducted the money, Told the consultant I did and it shows an Cell number and the Company name is Sanlam, Phoned Sanlam They don't have my details on the system, phoned the bank back I ask them why cant the reverse the money, they told me that I did accept an Debi check Mandate which I did not, I was advise to go to the police station to get an affidavit and take it to my bank, the following day I did that, Yesterday02/12/2021 I phoned the bank to follow up they did not receive my details, I need to resubmit the document, i told them that is B/S, Why must I keep on phoning the bank to follow up, To tip it all off another amount went of from my account on Monday, Why do you have a bank that cant assist you. THIS IS REALLY UPSETTING, ALL I WANT IS FOR THEM TO PUT MY MONEY BACK TO MY ACCOUNT, I DONT WANT TO HEAR THE SAME OLD B/S, I BUSY TAKING THIS FUTHER.