The worst experience with Mondo

I took a contract last year in December 2022, then i cancelled within 10 days (using the 10 day policy) Mondo collected the device. however the kept debiting me for 4 months . I have been trying get my refund since February i still have not received a cent. The worst part is that they do not call nor send an email to let me know what is going. Every time i call there is an excuse, i called and spoke to a lady by the name of Anisa she hung up on me. This is really frustrating