Account settled: struggling for closure of account

I never had a problem with Truworths,I opened this account to shop for office wear. My taste has since evolved and the pricing for items are quite expensive as there are cheaper options and shops available. I recently settled my account and requested to close my account and asked for a paid up letter. Been almost 2 weeks now and they are still trying to retain me as a customer after I clearly stated my wishes. I do not want and have to pay for something that I will not be using in the future. My expenses has changed, new bills and policies are added on, car and home re-payments, all accounts that I did not have previously. So in order for me to not be in debt each month, I am starting small and settling where I can. Kindly assist as I will be escalating this matter