Debiting the wrong amount

I sign up with netstar last year October for a 199 premium and to see they are debiting my account for more. I call the sale person Alison to let her know what's going on. She told me she will sort it out and I am in credit. Every month same story. So I reverse the debit and now the want to hand me over. Then I aslo call the center again chatted to Esaura she sent me a email from Alison to the billing department to change the amounts and credit me in April .Nothing was done. Now we in July no refund or change in premium.