City debits my account with R 80 000 and within 4 weeks can not even given an aster or respond

The City's service system debited our bank account on 1 day 12 times with 12 random transactions to the value of R 80 000. It has been 1 month, I have followed up 4 times and there is NO feedback. The Super user who is looking into this for the past 3 weeks is not even responding. Not a pleasant experience to wake ou with R 80 000 less in your account and nobody to assist you in a reasonable time of 4 weeks. Call centre agents are professional in taking details but can never give an answer or solution.