Account Settled in 2013 - Being Handed over to

In 2013 I got divorced and phoned in for a settlement amount - the balance owing was R727.81 and they said I can pay a settlement amount of R580. Was paid on 14 October 2013. Now I'm being contacted daily by Blake and Associates regarding outstanding money. I've mailed the Recovery Dept as Woolworths recommended, phoned daily for a answer regarding this and still nothing. Blake and Ass told me that only Woolworths can stop this on there side and that my name can only be cleared by them. If you phone Woolworths is about 3 different ppl you speak to but you never get to the right one regarding help to get this sorted. At the recovery dept you will speak to someone and then they say that the supervisor will phone you back and still nothing happens. I feel so upset cause my name is bad due to negligence regarding a payment that was done and Woolworths didn't close it down. They even confirmed that the payment is reflected on the system.