INCOMPETENCY OF TELKOM STAFF

My contract expired in February 2021, I cleared the balance due to them but they keep on invoicing me yet the system clearly shows that I was migrated to prepaid on the day contract came to an end. They were suppose to pay back the deposit I paid at the inception but since the end of contract, I haven't received it. Their call center is full of unqualified staff who cannot even understand and diagnose the problem that needs to be resolved.You can not even able to escalate the issue to the next level of management. I regret having contract with Telkom.