Delay in paying claim

I submitted my third party claim documents on the 29 June 2017 in respect of an accident that occurred on 23 June 2017. On 14 September 2017, I received the TP release document from AIG which I signed and emailed back on the same day. As of today, the payment has not been made for me to fix the vehicle. I have sent 7 emails to the lady dealing with third party claims and none of them has been responded to. I have even called AIG on the landline several times. At first, she told me that the payment will be made by Monday, 09 October 2017 and it wasn't made. I called again on or about 11 October 2017 to enquire and I was again told that there had been an IT problem and she promised that the payment will be made on Monday the 16th of October 2017 and it was not made. I called her again on 17 October and she said the payment was made on Monday and would have cleared into my account by Friday. I then asked her to put that in writing and send me an email confirming that. She gave the excuse that she was busy with another claim and would send the email afterwards and she didn't. With such an attitude, it is not surprising that she didn't send the email as promised. When you call and get through, you are simply told lies. When you don't get hold of her on the landline, you are told that she would call back and as usual, she doesn't bother at all. What is the reason for delay? Is it because I am not an AIG client? I never thought one could get such bad service from a company like AIG.