HELP ME PLEASE

On the 13/8/2021 i upgraded to a new data package. Unbeknown to me at the time it was for a 5G area. Some helpful MTN staff, Rapula Nyakale & Phumelelo Sijako advised me my area is not 5G. I then asked MTN customer care to put me back on my old data package, not allowed as it had been a promotional package but I could be migrated to a Standard package and then when I upgrade go onto any package I choose - another nice MTN staff Boipelo Phiri. I sent a message to Customer Care on the 23/08/2021 to ask that someone help me go onto a Standard Package and how to cancel the other 5G package. I was told by email that someone from Sales Department would call me, till to date I have not received any call and am still being billed for the new package with 140GB sitting on the router sim with no way of it being used. I was thinking of taking my Vodacom account over to MTN but not so sure now. My husband and I both work from home which we have now not been able to do since 16/08/2021, come on guys we need this data!