Incredibly BAD Service from Vodacom

I initially wrote to Vodacom on 23rd January 2017 to request amendment to my change of surname on their records. Tanya Phillips from Customer Service responded to request some details which I duly provided by 15th March. Nothing happened. I called Vodacom and spoke to Nkateko Maluleka who emphatically promised this will be sorted sooner if I provide some information to them which I duly did the same day on 15th March. Still no response. On 20th June I called and spoke to Dylan. Still no response/service. On 27th June I emailed Nkateko again to remind them. Still no response/service. Vodacom simply ignored my emails. On 11th July I called and was referred to Documents Division of Vodacom. I resent all the documents to Documents Department as requested on the same day. Still no response or service. On 11 September, I emailed again to remind them. Not even an acknowledgement came through. It is now clear that I am not going to get any assistance from Vodacom. I have been their customer for over 15 years but they all too happy to collect payment from me every single month without missing a day in the last 15 years but they cannot bother to amend the details of my surname change despite repeated requests and reminders all of which are documented. Surely Management should be thoroughly ashamed to preside over such cheer incompetence and arrogance in their bad service.