System continously overchages me

There has been the frequent behavior of having the Telkom systems incorrectly overcharging me! I have opened several complaints to the guys already. There are so many red tapes in as far as getting your query attended to. They have now suspended my account because their ******** system wants more money. Whats even shocking is that they, request I pay first and they will investigate. I raised the request in around May and with the promising assistance from a lady called Thembekile Khumalo, they apparently discovered that the system shouldn't have overcharged me for service I wasn't using. I initially started a contract with the for 10GB p/m data, paying 200. This year from February, that's when the behavior started. After they apparently addressed the system faults, they promised me free certain amount of data and airtime for valid within 90days. To my surprise, no one in Telkom knows about these. They close their incidents without the closure notes. They now have suspended the account saying I must pay. Their so called turnaround time for incidents is 3 days is a lie. I have been chasing them up since they suspended the service on 15 September. There are no agents nor supervisors