Poor and unhelpful staff working with customer complaints

Very poor customer service. I have emailed and phoned numerous times to have an incorrect debit amount fixed. After being promised by more than one agent that the problem has been resolved and the future debit amount will be correct and that a refund has been requested, the incorrect amount went off agin this month. Netstar do not provide any feedback on emails. Customers get transferred numerous times to different departments when you call and if you eventually get an agent that is willing to listen to the problem, they just promise you what you want to hear to get you off the phone. One can't complain about customer service if none is actually provided. Lets see if someone will actually respond to this or my 12th email send in a month to complain