Non existent after sales service

I upgraded two devices at the end of January 2018(one was to remain a cellphone device with a voice package the other one was upgraded to a laptop deal,data only),while the upgrade process went rather smoothly,I was left appalled at the lack of after sales support when I discovered that the two deals were swapped around,so instead of getting data,minutes and sms's on the cellphone this was allocated to the laptop and vice versa.Numerous calls to the call centre has followed since then which proved to be a fruitless waste of time from my side.(Ref no ********** 82 was given)From the 1st consultant telling me that they would not make such a mistake and that I must have requested this!!(me asking for minutes and sms's to be given to a laptop)but that the matter should be resolved within the next 12-48 hours to the next one telling me that their supervisor must approve first to the one telling me to go to the branch to have this sorted.Branch told me that the best that they could do for me is to email the consultant who did the upgrade and the wait to hear what he has to say. That was two days ago and I am still waiting to hear back from anyone at MTN as to how this matter will be resolved,while I pay my account diligently every month and the minutes and sms's keeps on piling up on the laptop,because it cannot be used and the cellphone that cannot be used to make calls as i don't get any minutes as I refuse to buy additional airtime !!!Very,very disappointing indeed.Can this be really be so difficult to rectify???