Incompetence is costing me

Absolutely horrible service (or rather non service) from Vumatel. They have no direct line for complaints/ queries and my ISP itself struggles to get responses from them. Its going on 2 months and I still have not been able to get my fibre working as Vumatel has not yet cleared the line (due to the previous tenants not cancelling in time), not sure why this has become my problem now. They have sent me two mails stating that they have tried to contact me which is absolutely not true. My ISP has had no issues contacting me on the exact same number so I don't understand how they have attempted to contact me when I haven't even had as much as a missed call from an unknown number. Meanwhile my mobile data bills are racking up as I wait for their supposed call to come.