Extreme dissatisfaction with the lack of service received

good day i have previously complained to you regarding MTN and being overcharged for my contract. I am a pensioner and am not able to pay the amounts charged hence i have contacted this company 6 times today requesting to speak to a supervisor but am not getting through. I then called in twice to cancel this contract but am still not successful. Reference numbers sent ***, ***,***,*** for some calls, is this not enough to frustrate anyone? I would like to request that a Manager contacts me on *** regarding the pathetic service and incompetency of this company. I would also like to ask whether you could assist with this matter as i did not receive a comeback from your team?