Bad Service

I have had a fixed wireless account with afrihost for over a year and a half. For the past 5 months I have been having issues whereby the signal drops. I have made numerous calls and call backs to afrihost and the consultants do a few tests and tell me that it has to be escalated to rain. Comes back and says that i need to move the router which i have now tested every spot at my house and no change, They eventually said that they need to change the sim card which was done but not change. They then told me that the network is congested. Eventually telling me to move to fibre at my expense. I have now got no choice but to do so. I have asked to speak to a manager on numerous occasions which never happens and no call backs. i have even e-mailed a person by the name of Vinay, but not even an e-mail response. This service is pathetic and would like an explanation as to how Afrihost plans on fixing this issue.