Agreement is placed but still charged for having that agreement

In My opinion when a customer make a promise to pay his words should trusted and not be treated like a ********. Far to long collection devisions has been flying under the radar. My wife's account went into arrears because of trying times, we have set up and agreement wth tfg collections team with a promise to pay and each month we pay the account without fail hoping the end point would result in us closing the account. However to be called each month and to be charged R43.00 with out fail becomes a huge concern as now your words means nothing. I have begged TFG to review there policy whilst still paying an having an agreement we are still being charged for having that a agreement which make no business sense. All its doing is giving the customer grieve. I now call on the humanity of TFG please stop sending your collection agents to call and charge us for something we are honoring. Can some one anyone with authority address this issue as quickly as possible.