Bad - worse -worst: Vodacom

After a month struggling with Vodacom about bad signal, I hope to shame them into doing something, anything! to commit to their side of a contract. After umpteenth complaints and phone calls nobody has contacted me and nothing has been done to rectify the situation. Monthly the debit goes off against my bank account but I cannot use my telephone and other supposed services are only active now and again. I live in a rural and hilly part of Natal but if Vodacom cannot render a service WHY DO THEY CLAIM THEY DO?