Telkom not delivering on the service im paying for....

in october 2018 i took out a uncapped lte 24 month contract with telkom for R899. i was told by the consultant that i would receive for my firts 150giggs a 10 meg line speed for the next 50giggs a 4 meg line speed and for the rest of the data i will receive a line speed of 2 megs. i understood that part of the contract and agreed to it. but what i cant understand is that within my 150 giggs im getting a line speed of 2meggs and under. Whenever i do a speed test thats the speeds im getting even less than 2megs at time. It is completely frustrating because im paying alot of money for a service that i was not promised. i logged a fault with the call centre in november and up till today i have not received andy callback from anyone at telkom. i dont think its fair as for im paying my contract every month with no hassles and not getting the service that im paying for. What is going to happen now? Am i having to go through this poor internet service for the whole duration of the 18 months thats left on my contract? will you be able to fix my problem if not what other solution is there to fix my problem? Are you going to cancel my contract and refund me.

when i asked the consultant at the store will i get my 10 meggs constantly his anser was "YES"