Upgrades ADSL Line speed, now Landline not working! No answer at Call centre

We received a call do upgrade our internet speed, we accepted. Now our landline is not working! I have locked the fault 185CTK190118 , the came back and said the problem was resolved, how? Nobody was at my property to inspect the phone, nobody phoned me on my landline to actually find out if it is working, because if they did they could hear that it is not working. Your call center never answer the phone, and I must phone from my cell phone , witch I am paying for and then you drop the calls. I have locked a new fault 51CTK220118 , are they also going to just say it is resolved. Your internet speed is not what we paid for or accepted on the last recorded line. All accepts of TELKOM IS BAD! I use my phone for Business, loosing lots of business calls, Please sort out my problem asap, I will have to port my number to other network to at least get some service and to go on with my Business.