Misleading arrears amount

My Standard bank vehicle account was in arrears. I made a payment of R7000 on 15 December and then R6700 on 22 January. This account was handed over to Gap Management. The latter sent me an email that I was R 6660 in arrears as of January including instalment for January. Which I duly paid on the 22nd. My credit profile indicated that I was only one month in arrears according to Transunion and Compuscan. I paid for this one month arreas recently and now GAP is sending me an email stating that I am still in arrears! This is misleading and detrimental to my credit score. Kindly update my credit profile as up to date. I cant possibly be one month in arrears in Jan and still be in arrears after paying the outstanding amount. I am planning on purchasing property and I dont need any arrears on my credit profile hence I paid!!!! Update my account accordingly. I am up to date!!!!!!!!!!