Service Provider refuses to refund over payment, with no warrant

It is now 20 days after rain has conducted multiple deductions of my monthly subscription for the data services, today on 17/06/2025, I had called into their support department to follow up on my refund, the lady on the other end confirmed that, they will not refund the money they took, this resulted even after rain made a commitment to refund my money, if anyone can help how I can report this ***** to the correct regulatory bodies as this is unacceptable