Rain false Product Advert

I have signed up for RAIN 5G Data plan in October,The Rain website coverage map is showing that the 5G is active in my area,i received my order device,i notice from day one that 5G was not even picking up any signal ,i reported the issue they promise that they will sort it out and it was minor problem. on 3rd Month the said no maybe the device or sim was faulty,they sent me a new router ,which did not even solve the problem . i reported the problem again and again dealing with new consultant almost everyday ,with my IT knowledge i forced the router to use the 4G network which help me for a while but the 4G network was slow and giving me problem about 5 months later that is when they sent a technician to come check my problem the technician immediate confirmed that i was out of coverage and the 5G was not available,i showed them the map and the map was still showing 5G ,they promise to refund me the difference of the funds or to Give me A credit on the 4G sim to cover the extra cost i was paying when i cancel ,early this month the router was not working at all even on 4g and i cancelled it coz was tired of the empty promises made by the company support team,They have collected their device and the last email i got from them was saying "They have received the device and has been tested ,they will escalate for a refund ,but was surprised when i was Debited for the amount of 699 when my account was cancelled and still waiting for pending refund.I cannot even remove my banking details from the website ,i see the next invoice will debit next month.From my point of view i never signed up for the sim to be debited every month ,i used to pay and insert my card detail every time i wanted to pay now they capt my banking details in their system.i am still waiting for a feedback from their BILLING Department ,to tell me how much exactly they going to refund me and when is it going to happen ,i also want the latest amount that was recently debited.but now all my calls are going trough the support and im not receiving any feedback from the Billing department ,before they even collected the device they where busy telling me they will tale ******* actions if don't want to give them their device as if i rejected to return it.now they have collected it ,im not receiving any attention for my refund .i just want my money,i have been paying 699 since from October Last year.But everyone was aware that i did not have the product benefits of what i was paying for.please i need help