Erratic and low fibre speed

Dear Vodacom, I upgraded my fibre connection in August 2020 to a 50 mbps line and since around 3 weeks ago i notice that the line speed has not been anywhere close to this. I logged a call on 13 October 2020 and since have made numerous calls to your support centre but without any success, only excuses. Since last week, your call centre now doesn't even answer calls. I tried various other options but to no avail. I unfortunately now have to resort to this form of complaint with the hope that someone at Vodacom will pick up on this compliant, have it escalated and resolved. Since logging my call with you, i have had no response, not even the courtesy of a call back. I have now made about 8 calls and am now completely fed up with this lack of service and incompetence. It probably time to move on to another service provider.