I have 2 *** on them I paid on the 25th then I received money on the 29 on my

I have 2 *** on them I paid on the 25th then I received money on the 29 on my *** then they deduct again and when I go to the store they said they don't refund how is that my problem and they will expect me to pay again in this month while they deduct twice for 1 month I never had this before and my *** is not on arrears the service is very bad and if I tell I'm not going to pay I know so that they will go where I work I regret why did I open *** with them