*****! Lost documents and cover up!

I am paying the price for Standard Bank's mistakes. Would not recommend anyone dealing with Standard Bank in future. Standard Bank has lost original loan agreements and documents pertaining to my revolving loan account. There is no loan agreement on file with my signature whereby payment duration and interest rate had been agreed upon. Standard Bank has been thumb sucking interest rates and details about the loan and when enquired, I was has handed over to an attorney for collection. I have received multiple different summons with multiple different amounts and interest rates charged for the exact SAME account. This in itself shows the ********* practice by Standard Bank. The attorney in question refuses to assist and keeps adding charges onto this account. In fact the account is also prescribed yet Standard bank updates all credit bureaus monthly with the same information. Despite my best efforts to resolve this over the past 3 years, I have run into brick walls. Calls to the Standard bank customer care line for a simple statement has not been resolved. Standard Bank, you are *******ly coming up with interest rates and amounts on this account and ruining my credit health due to your mistakes. How is this ethical? I have consulted with my lawyers to take this forward. Please be very aware and check contracts signed as they sneakily lose documents and then charge as they please.