POOR POOR SERVICE VUMATEL

Its now been over 3 weeks with my line being super slow. I have a 50mb line and only getting 18mb on a good day. Some nights as low as 8mb. I have contacted Afrihost every week and told me they have logged a ticket as on their side it shows 50mb. I have done the LAN cable tests as requested so many times. No ticket has been logged. I'm working from home and has been so challenging as the line drops the whole time. This is also not first time this happened either. I'm paying for a service which I am not receiving. Please assist as I am very close to to cancel this service and using another more reliable source. I'm paying for a 50mb line, will I be re-imbursed?