Telkom not even able to help me

I am the owner of a Telkom Wireless Handset, who has moved. On opening of the contract Telkom advised that if I moved I just need to change the address so that the service can be changed to the new location or the handset won't work. I now struggle to get signal on my handset and have tried to change the address to my new home but can not get assistance from anyone. Went to the Telkom store and spent 1.5 Hours after which they said they don't know how to do it and that I need to leave and come another day. I then called the call center the next day. The first lady said it can be done and tried to help, after which the call cut when she tried to transfer my call. I called a second time and spoke to someone else. I explained my query and she said it can't be done unless I cancel the contract all together and I then have to reapply like I was a new customer after a month. I am paying for the handset monthly despite having zero signal because Telkom has staff with no proper knowledge of my issue.