Internet speed weak and dropping

Good day, I have been experiencing problems with my uncapped 20Mbps line since the day it was installed. The installation was was done 4 weeks ago and since the installation has been done I average at speeds of 4Mbps and if I am lucky here and there 8 Mbps. I tried to contact Telkom telephonically and over online chat to resolve the issue, but I keep getting told they have a issue in the area and technicians are working on it. Now either the problem is massively huge to take 4 weeks to resolve, the technicians are not working on it or there is not a problem in my area. My neighbour has a 10Mbps line and he is getting his 10Mbps uninterrupted. A new pole and new line has been installed and there is nothing wrong with my router settings, it is just my connectivity speed that is extremely low and it seems nobody wants to assist me to fix it. I got the line to be able to continue working during the lockdown period and the weak line dropping is seriously affecting my work. All I want is just for the issue to be resolved and to get wat I am owed, because I was initially planning to upgrade to a 40Mbps line and started with the 20Mbps line as a test run and from what I have seen I sometimes wonder if it is not better to just stop everything and try something else. I just want what I pay for and I do not think it is unreasonable to ask for that.