Very bad to no signal

Please help! I have been living at the same plot for 13 years, I have had Vodacom all this time. From 2009 the signal started to deteriorate, last year Sept I was forced to report the matter as the signal would regularly cut out. Vodacom said they would look into the matter. Later when nothing happened and I phoned I found that they had closed my ref no as if the problem had been fixed. They logged a new ref and when contacted told me that they are busy building a new tower. With time my new router is now not able to get any signal and the routers are not faulty as they work in town. We replaced the phones, still no signal. If in the past the signal was good what happened now? They promised to contact me with an update on the tower, but I have heard nothing from them. We have to pay our bill every month but have to sometimes try 4 to 5 times to do a download, sending email at certain times is almost impossible. Some months I have up to 7 GB left as I am not able to use it any more. Vodacom only wants us to speak to the call centre, is there someone higher up I can speak to? Landline number supp**** as I have no Vodacom signal.