Faulty Cellphone

I have been having mega problems with this phone - it loses all connection and just dies on me. I have taken the phone to Vodacom in Cresta on countless occasions and all the technicians seem to do to fix the phone is take the battery out, push some buttons, then the phone comes on After that has been done the phone lasts maybe a week or two, then dies again. On numerous occasions I have been told to take the back cover off the phone, remove the battery, rub the contacts on material, then put the battery back in. That has worked a couple of times, but unfortunately I cannot stop in traffic to take my phone apart so that it works.<br> <br> Vodacom Repairs Cresta have taken my phone and booked it in on two occasions: on 6/6/2015 and on 25/10/2015 (I have the dispatch notes if required) and have returned the phone to me \in working order\". The \"working order\" generally doesn't last long and I'm back to square one again with the phone being completely dead. As I said above, I have been to the Vodacom shop in Cresta on countless occasions for over-the counter \"fixing\".<br> <br> My contact was taken out on 3 October 2014 <br> <br> Hope someone can help me \"permanently\"?<br> ***7 (Heather)"