Vodacom bad service

This is my third time writing about Vodacom. Each time I get expressions of regret, and promises of action, but the situation remains the same: my cellphone reception in the Franschhoek / Paarl area is so poor that I have to transact business on my land-line. A second gripe is that Vodacom only send me a monthly Statement. Despite several requests, they do not send me a Tax Invoice.