Extremely Poor Service from Aon on a simple claim

My wife hit a pothole in February 2015. I followed the procedure and claimed from JRA. JRA assessed this as a valid claim at the end of April 2015 and passed it onto Aon for payment. Refilwe Seefane was the claims negotiator assigned. She never answers her phone or returns phone calls or emails unless you phone or email multiple times and make threats. I have being pursuing payment since May for the R16256.90 damages suffered. I had to replace all 4 tyres as the two left hand ones were severely damaged and had 50% life on the tyres. The tyres are different sizes on the front and rear of the BMW 325i sport. After much frustration and speaking to numerous other people when trying to get hold of Refilwe, I was finally made an offer of R4013.60 on 1 September 2015. This is an insult of an offer. I asked for an explanation on Sep 1, 2015 at 10:46 via email and as of 12/09/2015 I have still not heard from her. My patience has run out! Apart from Aon being even slower than a Government run organisation like the JRA to deal with my claim. Their overall service and offer is pathetic to say the least! I will take this matter up with the Insurance Ombudsman next if not settled this week!