ZTE wifi home rooter I canceled my wifi by mtn because after I paid my service was cut

ZTE wifi home rooter I canceled my wifi by mtn because after I paid my service was cut. I took my rooter back and I have sent many emails requesting my money back for a service I can't use. It's been since February 2025 and till today I got no response from mtn they are quick to take your money but to refund it another story. Went to the mtn shop to find out what's going on was Said that u must contact mtn customer care. I mean it's been how long. Don't use mtn the service sucks. I am planning on taking this further.