The WORST service ever

On the 30th Oct 2015 I contacted Cell C with a problem that I have with phone, my phone has not been receiving SMS's nor sending them and I have wanted to get to the bottom of this, I would truly like it to be fixed. The first lady I spoke to with regards to Customer Care side basically asked me to change my Centre number, which I did, but nothing changed and nothing happened. I then spoke to a second lady at Customer Care and I told her the problem, I asked her that I need to maybe speak to someone in Technical department as nothing is working