Poor service

My Sony Ericson Z3 was sent to the repair centre for repairs, the back glass broke . After receiving my phne back from the repair centre I noted the following day that the new glass installed was in fact coming loos. I took the phone yet again to Vodacom Key West to have this repaired yet again. The phone was sent to Vodacare again to be repaired, I was notified that my phone was ready for collection , the SIM tray was not in the phone. I phoned Robin at Key West and he said he would phone Dumi to sort this out, when Robin got back to me he said that Dumi is not in JHB but I am welcome to go to Fourways to go and fetch a SIM tray from them, I am from Secunda!!!. I eventually got a SIM tray Vodacare sent to Key West about 4 days later. I noted aproxmately 4 weeks later that the glass is loose yet again. I have phoned Vodacom`s call centre to lay a formal comlaint I spoke to a gentleman by the name of Benjamin ,he could not help me then Jesuf from Capetown phoned me and promised he would get the right person to contact me to resolve this matter as I told him this is not my fault and do not see why I must be with out a phone. Needless to say no correspondence from any one. Pathetic!!