Mswipe Technologies — Incorrect rental deduction

I have purchased machine 4 months back by paying 2360rs which is claimed to be rental free machine they charged me gst also but till date I have not received any invoice copy. And they are also charging me rent of 413rs every month and after complaining they are responding me that this is a technical problem and even they are not refunding my amount back and doing deduction of 413rs from last 4 month from my bank account .stop this or you can take your machine back .I want my refund.