Rain still debits my account after cancelation. Disgusting

I wish their had zero Stars to rate Rain. I have canceled my Rain sim in Feb, end of March was my last debit as per the customer service agent. I then receive a notification end of April, the amount went off and the next debit date reflects May. I have tried calling Rain to reverse, I have emailed them no response. I need my money back into my account. If this is not resolved, I will go and take legal action. Rain supposed to be one of the best networks. They have failed miserably.