Absa credit collections

I had a credit card with absa that fell in arrears, on the 7th of July I contacted Absa credit collections and made a payment of 10 000 towards my balance of 20 0000. on the 8th of July i received a letter from Absa stating that my account was sold to MBD collections, When i called Absa to find out what happened to the 10 0000 that i paid on the 8th if July and why it's not reflecting on the statement from MBD they say I need to call when MBD, when I call MBD they say I must talk to Absa, I have been calling from last week Thursday to get clarity as to were the money I paid went to I get no answer, on Friday I was told the issue was escalated but still no response. please urgently assist as I want to settle this account and I cant do that when my payments are going missing,