COMPLAIN REGARDING MY SETTLEMENT OF ACCOUNT

Good day <br> <br> I have a problem with furn mart furniture shop. I made a purchase some time in June 2015 for R6,741.01. By the 07/07/2014. I made a settlement payment of R6,741.01. Since the 15th of July I have been receiving calls and sms every week from them claiming that they haven't received my payment and they also threaten me to take the legal action actions me.Today I called Hammanskraal branch and I spoked to Lesego Kekana, I asked her how much is my outstanding and she confirmed that I settled my account on the 07/07/2015. today I also received an sms that says that my account is in arrears, I was also been called by their legal department last week Friday. on the 25th of August I sent an email to them containing a proof of payment from my bank statement and later on that day I received a noreply email to confirm that they received by email, proof of payment. Please help me to get rid of this people, since they think that I have free time to entertain them for nothing.