Dont accept sales calls from MTN

In January 2019 around the 28 I received a call from MTN offering me a 20 day and a 20 night data. I accepted and trusted that all will go well howeverI just **** to myself. From the 12 of February which is my top up day I have been receiving 10 day and 10 night data however the deduction from my account that month was for a 20 day and a 20 night. i contacted MTN from the 12 Feb asking them to resolve the query however to my surprice no one at MTN is able to resolve this. I have been sent from pillar to post and today is the 28 March. I didnt know MTN had so many partners but now i know and none of the partners can even help me. So if anyone calls you to offer anything from MTN please dont accept for your sake as MTN doesnt care about its customers all they want is just your money and now i am left stranded because i dont know who can help me i have exhausted all means