Incorrect data billing

In June this year I requested for data bundles on 2 of my contracts with Autopage. It was confirmed telephonically but to my surprice I received an account of over R5000 for my 3 contracts of which over R2000 was for data. I was highly upset. I phoned Autopage and requested for the data bundles again. I paid the entire invoice even though I felt it was a mistake on their side. I requested them to check and listen to the telephone recordings. An entire month went past. No response from them. At the end of August I received another invoice of over R5000, R2000 being data again. This time I was furious. I phoned them and the excuse: sorry, the data bundle was activated but rejected by the network!!! Really???? And you just left it??? Once again I was assured it would be sorted out. Telephone recordings etc. Needless to say. Not one phone call about my queries!!!! Only a call to tell me I better pay my account or my lines will be suspended. I explained the situation to the lady and told her I already paid R2000 additional in July which I should not have. Lines suspended. Spoke to someone 2 weeks back. Told me about a R2000 pending credit. Promised to phone and confirm. Heard nothing!