Unable to use data

Good day, i recently renewed my contract with telkom mobile. They checked my home and work areas for LTE coverage and assured me i would be able to use it. I am 2 months into a new contract, i cant connect at work to the internet, i apparently use 5 gigs of data in one week even though i dont know how this is happening. I tried to use my 15 gigs night time this morning at 6:30 and I cant connect at home. I am being billed for a contract and i cant use the internet. I am disputing the data used and also the fact that they sold me a contract that i connect with. I have made a complaint with the technical team last week and i have had no response. Case number ***5. I am not happy .