Service and Response Lacking

I have had slow fibre connection since inception of my contract last year. I have called the call centre and emailed numerous times. To date I have been promised twice for resolution and ignored the rest of the time. I need the correct speed and unshaped bandwidth etc. on my line. these are simple requests as per contract which Cell-C has rescinded on the terms of business. I trust this meets a speedy response with resolution to the matters on hand.