Loyal customer - not impressed

I have a smart broadband unlimited LTE product. On the 15th of March I logged a fault since I do not have a service. An appointment was made with me for the 6th of April where a technician was going to come out to the premises to investigate. Nobody pitched up. I have queried now on 4 occasions and still no response. I AM PAYING FOR A SERVICE THAT I AM NOT RECEIVING.In a weeks time I will be debited for the second time for something I am not receiving.