Rain internet service is a ****

I have been using rain internet since the first year it was introduced on a 4G uncapped plan, then December last year I decided to move on to their 5G two SIM plan.

To my understanding the service is a pay as you use, all of a sudden I am receive monthly bills even way beyond the amount the plan was advertised on. Since January I have sending tickets to their support team requesting for someone to contact me and explain all this madness and I always get a message stating that someone will get back to me but they never do.

I resulted in deciding to stop using the device and service in January due to this but I'm still being billed monthly which makes no sense to me because I have never signed a contract with rain binding me on a contractual agreement with them so why am I billed monthly for something I don't use.