Administrative inefficiency

I am getting frustrated with Direct Axis. A few weeks ago, I app**** and got a consolidation loan. One of the creditors to be paid was Mercedes Benz. I then called Direct Axis last week and requested proof of payment. They sent me a Settlement Letter with an incorrect reference number (not my account number). I sent an email last week Wednesday alerting Direct Axis of this inaccuracy as Mercedes Benz is refusing to settle my account. No response till today. I called this morning requesting the actual PoP, not a settlement letter. The lady sent me the same settlement letter with a wrong reference. That reference is apparently somebody else's account, not mine. I don't know how many times I am going to call and send emails to have this corrected.