Pathetic service

For four years I have been complaining to Vodacom about the same issue, biz I will have good connection to their network yet there is no data transfer happening. At the time when I took the contract, Vodacom had a network coverage map that showed that I have coverage, yet this issue occurs regularly. Each time that I complain, Vodacom gives different reasons, but never solutions. This negatively impact my ability to work as I work from home for an international company.