Unable to assist with technical support

I bought a 20GB data bundle that is valid for 6 months. But ever since i bought this bundle k havent been able to do any work, because the network coverage is very poor. I've been to the telkom store in Greenstone and they said\ they cant assist with technical issues they only sell products"I've called the call centre four times and they only have settings for android tablets they cant assist with my Lenovo tablet which uses Windows.<br> <br> I've asked to return the data bundles i purchased since im unable to use it but they said i cant return a prepaid bundle. I have spent R899 for a service i cant use and no one at Telkom has the expertise to resolve my issue."""