Telkom uncapped wifi

We are a Telkom customer for awhile now. I order was uncapped wifi 4meg line. All was good till August 2019 when we received our billing. They charged us for a 8 Meg line from January month. Account over R2000 where it should be R604 at that stage. We queried this and reference after reference, line get suspended more than once... After they told us just to pay the normal fee for 4meg line. We were at the branch as well where they promised this will be fixed. Nothing as yet. We tried to take out a contract for my child.. And it was not approved because of this outstanding amounts. And best of all they charge is penalties for late payment on this account which they "are sorting out" More than R700 credit to be past at the moment. We phoned again on Friday and another reference was giving.... They will get back to us. Up till now nobody got back to us. This is pathetic.