Unbelievably Pathetic Service

My contract phone with Vodacom has been problematic since 1 year into the contract. The phone has to be on charge 80% of the day or it switches off & usually takes the whole day for the phone to switch on again. Phone shows as fully charged but one phone call or chatting/browsing for a bit & phone switches off if not placed on charge. I've replaced the battery, doesn't help, it's definitely the phone itself. The handset hasn't worked for a while now. I have to decide to ignore calls or answer/call on speaker, this is really inconvenient as I can't even have private calls. I've gone into Vodacom stores & was told that the technician is not & I may do a software upgrade myself online. TWO WEEKS AGO I went onto the Vodacom website. A sent a request for assistance on a new phone/upgrade & received confirmation that I would be contacted for assistance. NO ONE has bothered to call, nor have I been able to get through to the call centre for 2 weeks. I emailed Customer Care on the 17.03.2016 in response to a query from them of a complaint I lodged on their website. I advised them of the above and informed them I would proceed to lodge a complaint with Hello Peter. To-date, still no contact