Hmmm
Sounds like a dealer issue, as opposed to a Jayco issue.
Was the awning dealer fitted or ordered from the Jayco factory?.
I bought an awning from prestige via ebay and had it sent up to Cairns after I bought my camper, and this had the same brackets that I installed, which was OK in my case, however, if your awning was dealer fitted from new, then they should fit the brackets from you
cheers
Nutto