Amazon Associates — deduction in My Debit Card without my knowledge

Initially i just created my account and logged into Amazon associates. I was deducted 120 rupees from my debit card for membership fee. Later on i completely stopped using it. Its almost about days i logged in. However, I now have been deducted for about 1890 rupees but don't why. Information given is "msdhostfee". They did not specify in terms and agreement so i just stepped behind not using it but now unnecessarily deducting from my account. I want my money back or refunded, They did now inform us or even intimate before that they would deduct. This is truly unfair. please help us to get back our money. I just want back my money which was deducted directly from my account. going forward I should not get any deductions from their side, i would like to discontinue and shutdown my account. I just want my money to be refunded.