Woolworths

On my Woolworths account I was in arrears in the year 2015 , then after numerous phone calls regarding payment I then payed the settlement amount (R382.00) in order to get out of arrears and free the account on date 31/01/2016. The issue that I'm having is that up until this very day I'm still getting phone calls from Blakes and Acciocates . They have asked me to email them proof of payment on several occasions , and that's exactly what I did . The company says that the money was reversed , I paid cash at the Shoprite Phoenix branch and have the proof of payment . The Blakes call center is still phoning and harassing me for the money that I have payed . Please assist me .