Typically, I would recommend sending an item back to the manufacture, but based on my experience with Graham, if you want your arm back in less than a year , look elsewhere.
Sadly, this is an important consideration. Do politely reach out to Graham and hope for the best - he does pop up occasionally. But If I were OP I’d also start looking for another compatible wand on the used market. Were you looking for a wiring upgrade or fix of an issue? Sometime later wands are backwards-compatible and feature better wiring.
I bought my Phantom II Supreme in 2013 from an authorized retailer, but by the time I wanted an extra 10" wand about a year later, there were none to be had for a while. Then a couple years later on the III came out and I guess wands were available finally. I don’t know the current status. But I sourced my extra 2 wands on the used market with some patience.