Breach of contract-failed to carry out whats in their policy and claiming what is not in their policy

Due to unfortunate circumstances my front windscreen on my vehicle was cracked. I lodged a windscreen Claim with CIB for the original agent glass to be installed in which they agreed to install .The quote on the agents glass is R4455.46 and the excess is 20% which calculates to R 891.10 which I accepted and have email proof of this .

They then come back after agreeing to above ,and change it to below-

“CIB confirmed now they can only authorise generic glass as the vehicle is out of warranty. I then spoke to a consultant and she confirmed the only other option if you want the agents glass is if you pay the difference between the agents and generic which is R 2061.46 They would’ve authorised the agents glass if the vehicle was still in warranty.”This in not in the policy.

This is in breach of contract as nowhere does it state this in their contract neither can they give proof . My broker and I on numerous occasions have requested them to show this in the contract where they will only install Original agents glass on cars that are still under warranty, which they are evasive, avoid the question and downright do not give proof it’s in their contract as they cannot .Cannot show something that is not there . I have a copy of my contract and It’s definitely not there.

If this matter is not resolved favourably,I will have my attorney take this matter up with the Insurance Ombudsman for short term insurance for breach Of contract. Carry out what is in your contract ,do not lie and claim what is not.