No help from Vodacom Customer Careline

I took out a contract with Vodacom 6 months ago . My handset is an A5 Galaxy costing R400.00 per month . My family cannot call me from the UK since i had the phone . After so many emails and phone calls to Vodacom I am just given reference numbers with nothing happening . They do pass the buck onto the UK side saying the service provider O2 is at fault . Not so because my wife can receive calls from her family . I am so frustrated that now I have offered to take a more expensive phone and pay more but they still do nothing except pass the buck . My total account with Vodacom is around R1000.00 per month and I would have thought better service would be forthcoming . Be careful when you sign on any contract with a cellphone because once you have it and find a problem they just ignore the obvious and keep sending differnet reference numbers and ask the same questions . Still nothing is done even when I am prepared to pay more and give the faulty phone back . Something is definitely wrong with their customer careline. Regards Ray Buckland