Charging cancelled services

I have paid up my account 3 months ago, and had them cancel all extra services to my account. But I'm still getting a statement each month going up with a R100. I haven't bought anything this account is supposed to be up to date and not accumulate any new charges. I have gone in to the store where they have advised me to do the cancelation online, which I have also done.

I have tried emailing them and don't even suggest phoning them.

I am going to try and close my account today, where they will probably tell me that I have to pay up before closing the account. So they have actually ****** money from me. I'll say Mr Price is *********. Rather support other stores.