Very bad experience with getting my data connected

I have subscribed to afrihost fibre. The router was delivered on time. I have phoned their call centre numerous times, speaking to a different agent each time. I am unable to obtain internet access and they are having trouble getting my data connected. I have asked NUMEROUS times for them to phone me back, as I have to hold on for 20min before someone can assist me. 2 agents have promised to phone me back by a certain time and I'm still waiting. If I send the "help sms line" at 17:00, they phone me at 22:00 at night advising to shut down the router and "try again in the morning". They have sent me an invoice for data I am still not able to use! This is really pathetic. I have worked in a call center as well and treating clients fairly was my priority. I cannot keep on struggling like this, really. Please get someone to phone me ASAP tomorrow morning at 08:00 to have the data sorted out or link me to a new data contract. If the service is this poor now, how will the future be??????