********** usage and collections irregularity

I have two(2) contracts with Telkom. I had insufficient funds for June 2018. I left it like that because my 10gig data bundle also showed used every months since I took out contract in May 2018. Every month since May 2018, my 10Gig contract was left with 4 gig. I deliberately left the contract inactive to see what would happen to the 10gig per month. I didn't use the account for three months when the account was inactive, but the data was used. The account was activated in August 2018, however I did not receive my data. It showed that the data was used even though the account was inactive. Even after the account was activated the contract should revert to the original agreement where the deduct from my bank account. Collections continue to collect on the R550 although the contract is R347. Why? I contact the call centre on 081 180. My call was disconnected as my airtime was up. This is not a free service as stated. There is no office to complain at. They refer you to the call centre. But you must call on your own airtime. The calls are disconnected when you run out of airtime and accordingly, they do not need to deal with complaints.