LTE Service does not work

I have a Mobile LTE contract with Telkom for 3 years. My contract expired 7 months ago after which I extended my contract. However my data line has not been working during daylight hours for the past 5 months with no assistance from Telkom. I have tried multiple times to get them to come check what is wrong with the network with no help. They keep giving me the same settings instructions to change which does not work. When I tried to cancel my contract, I got called and told that they would send someone to come check my device which never happened. I now have tried to cancel again with no help.