Unnecessary correspondence

Have a account that I have been paying with them for almost 5 years. Looked at the statement, thee charge a person twice in one month for the same thing. They even charge for sending a receipt. Where I asked them to stop sending this useless info. Today all the lady could say was, pay more on the account then you will pay it off earlier. When asked if I pay the full amount she said there client doesn't allow for a discount. You need to pay the full amount. Yes but stop sending letter for unnecessary stuff. And then she said they send it to a email and a sms. Hello I'm a grown up I know that I need to pay and I don't need reminders or acknowledgements. Once a year is more then sufficient. I will never finish paying this account of if I pay 1200 per year and your fees are 420 per year.