First National Bank is really thieving our money

My Account and funds have been used **********ly to book a hotel for a week amounting to R36200. This complaint is with their ***** department. When I checked my statement today the was a charge of R724 again that is linked to that hotel transaction. I would really appreciate it if this could be explained to me as to what really is happening with this leak. Our money is no longer safe in the FNB accounts. I called but was on the line for about 30 minutes this morning without being connected. I need to know why am I charged for a transaction I now nothing about why?