I am being harassed by MBD for the debt settled

I've been getting smses and emails from MBD for a woolworths account which i paid-off in 2012. I called their call centre in March to inform them about this and the call centre agent asked me to send an email with proof of payment but the smses and emails have not stopped to this date. The interesting part is that they are now asking for three times less than what i paid in 2012 of which makes MBD seem like a *****.<br> I want these people to stop harassing me and im going to refer this matter to the consumer complains commission so that they can investigate if i wasn't exploited by MDB in 2012 by making pay more than necessary.