zero help provided

Since I upgraded my phone I have been unable to make/receive any phone calls/sms''s. I have no other means of communication. In my house there are 3 different vodacom cellphones and all have the same problem. .. I have been to several vodacom stores and none of them are able to solve my problem other than informing me that I have to sent my phone in for a month (without receiving a credit on my subscriptions) when I call the call centre the standard response is a network problem and that they are dealing with it (funny how my phone detects this network problem all over gauteng)... when I get angry after repeating the same problem to the same consultant for the 10th time they merely put the phone down on me including supervisors and managers......<br> <br> Co-incedently my tablet always have full signal in all these areas that I visit.....<br> <br> Can some-one please explain this to me as I am now done trying to get my phone fixed.....