Refund due to me and lack of communication

I called MTN in October 2023 to cancel the promotion i was on as i couldnt afford the out of promotion price , i called in and the agent i spoke to had advised me that he would put me on a month to month bundle for 8GIGs which i can cancel at anytime , i also only upgrade my daughters number *** to 28GIG , i wasnt advised of any bundle rate pricing and that i was placed on another contract , i have logged several calls for this issue due and finally spoke to Preniece of which is another division of MTN, eventually after more attempts of calling customer care she eventually called me back and advised i was correct and they will refund me by the end of December, December came and went. i have email confirmation from Preniece of the refund / Credit confirmation and till date i havent recieved a phone call or the refund. i have called again and got a lovely lady to assist me she logged anther call for me *** and *** , *** i still havent recieved any phone call from them. i have been trying to call now i cant get to speak to any agent and MTN has blocked my number *** now i can make calls and use my data. they say i owe i asked how so when i have credit due back to me. this has really been frustrating as i do not know what to do now. its easy for my money to be taken out twice not correctly but now when i am supposed to recieve my money back its a mission to a point of MTN blocking my number. i really need help here with regards to my refund.