VODACOM SERVICE COMPLAINT

I would like to complaint about the APPAULIING SERVICE from VODACOM. I have sent numerous complaints to VODACOM and they just ignore my e-mails!!! I have been dropping calls on a daily basses ( at least every second call) for months now and this is in various areas. In the past this has happened vary seldom. SURELY VODACOM IS NOT STICKING TO THEIR CONTRACT TO PROVIDE CONSTANT SERVICE??? We as customers just have to be satisfied with this... at a cost of redialing numbers every few minutes!!!! I, for instance do not have signal behind my desk at my Office.... HOW CAN THIS BE A CONSTANT PROBLEM???