FAILURE TO PROVIDE ACTUAL PROOF & POOR CUSTOMER SE

I have been billed extra by Altech for a few months in a row. When I queried this, I was given a different story every time. I was contacted by Sifiso Mlangeni after my previous Hello Peter report. I asked for proof of my alleged telephone usage and data usage (which i know i did not sue) from January 2015. He responded to my queries via email a week and a half later. The \proof"which he sent to me was 3 EXCEL sheets with random numbers which tells me nothing apart from one column which has dates and times. I rep**** and mentioned this is not actual proof as anybody can make up an excel sheet and type in anything to suit themselves.He rep**** back very rudely stating this is the proof I wanted and the case is considered closed from Altech side!! This is pathetic service. I suggest he goes and reads the CPA as I am now taking legal action against Altech. He cannot consider the case closed without resolving my query and providing with proof. I am sure a big company such as Altech has proper usage track records. I was told I can only get details for 4 months back"