Poor network

I moved into a new place two months ago. All four of my telkom mobile devices have issues with the network. The signal on 2g, 3g and 4g are fine, however calls drop, internet freezes until i reboot and i cannot hear people on the phone half of the time. I waited 3 weeks before logging a call. Its now more than 4 weeks later and no help. A tech was sent to install a booster for my modem but he did not return to do the job. The booster will sort my modem, but what about my phone?

I wish to cancel one of my voice lines as my wife uses it and i cannot hear her when i call home. I will keep my line as my phone works at my work place.

The call center and shops cannot assist in the cancellation. I am willing to pay the R300 balance of my contract. I am not willing to pay the R800 early cancellation fee as it is not my fault.