Furious Customer with double debit order

I have been complaining about Rain suspending my connection without any explanation. Instead I get an SMS saying my account is in arrears and i need to make a payment which puzzles me because the debit my account monthly. Today the double debit me without any consent !! I'm gonna reverse the 2 debit orders and cancel my subscription. Worse their connection is very poor!! What happens now to my other debit orders when you double debit my account.. I'm so mad right now with such poor service. The only changes i made was to change my debit order date from the 25th to the 01st now i get this nonsense!!!