Delayed claim payment

I had submitted a claim to Johannesburg Road Agency on 08 January 2020 after having a puncture due to the poor road conditions with a lot of potholes. JRA assessed the claim and authorised the claim. The report was sent to AON so that they can pay the claim. Aon requested for documentations and I submitted everything to them on time. It took about 2 weeks for the manager to sign off the settlement offer. The settlement offer was sent to me on Thursday, 26 February 2020 and I signed it and sent it back to AON on the very same day. What is frustrating me now isa the fact that when I ask them about their Turn Around Time (TAT) and your Service Level Agreement (SLA) no one is taking my question into account and the claim is still not paid. I don't understand why is it taking AON so long to make a payment. AON, you are a big corporate company and please do the right thing and be accountable.