Terrible Service

I have been having the most horrific experience with RCS. Last year because of lockdown my account got into arrears. I have been paying my account after that and trying to get it back to normal. My debit order was cancelled for one or unknown reason. So........ the 16th of August I received a call from an agent of the collections department regarding my RCS account. We made an agreement that I will make a payment of R1700.00 on the last day of August, which coincidentally is my salary date. However............. instead of the agreed upon amount of R1700.00 being deducted, the amount of R17000.00 was debited from my bank account. Today is the 18th of August and to this day RCS has not been able to assist me in refunding the money that was wrongfully deducted. I have been calling since the 31st of August every day and I am being sent from one department to the other department and still nothing is being resolved. My bank account is currently in arrears and is being charged interest on a negative balance on a daily basis. I seriously just need this to be resolved.