Momentum not helping at all

I have logged a call with Momentum insure. My son had an accident with his motorcycle. Netassess came out, assessed the motorcycle at a bike shop in PRetoria. First Momentum informs me that Net assess is saying that it is not economical to repair the motorcycle due to the damages that is 75% of retail of the motorcycle. Damages is not 75% of retail and someone clearly need to redo his math calculations. Momentum did telephonically in a few days later confirmed that they realize that the damages is not 75% and actually much lower. Days after struggling I had to hear from Momentum that the actual reason for not wanting to repair the motorcycle is that Netassess said that spares are very scarce. This is absolutely not true. The bike shop confirmed that spares are already available. I am wondering can Netassess do their job properly? Do they know how to assess? Or is the problem with Momentum who cannot give us the correct reason for not paying? Due to Net assess assessment of the motorcycle, Momentum want to write off a motorcycle that is not even 2 years old. Momentum rely on Net assess to give them the necessary information and in the meanwhile clients are struggling. The write off of this motorcycle and the payout will not even assist us in buying the same motorcycle. Service was absolutely not great and one week and 4 days later I am not even sure what is the final outcome of our claim. Limited communication from Momentum and now I am still without repairs and not knowing what is the next step. Momentum can in writing please confirm the outcome after I told them I am not writing off a motorcycle that has limited damage.