To my knowledge, RS don't do any Fett pieces and/or commissions at all any more. Now, that's kind of irrelevant if you ordered when they were still doing commissions and is really poor of RS not to finish your order, nor to proactively contact you about a refund. As others have said, I would abandon any and all hope of ever getting this order from them and e-mail them every day asking for your money back until you get a response.
It's weird, I've heard a few horror stories about RS but they seem to just get a pass on everything because of the whole "lineage" USP. The whole Boba Fett thing with them annoys me because as far as I know, they have never publicly explained why they just stopped offering Fett armour/commissions/paint jobs etc. I heard it was because it's too time consuming but I mean...that's your job? Yea, a Fett commission takes a long time but if I remember correctly, they charged like £5,000. Just manage people's expectations and don't over promise. As OP has illustrated - people in this community have tremendous patience and if you tell them - "Yeah, this will take a year" many would wait a year.
They also started a "building boba fett" video series on YouTube which was just left abandoned, again with no explanation. I suppose I can understand if you decide not to sell the parts - you're a business, that's your prerogative ultimately, whatever the reason but why do the how-to videos on it have to stop too? As we all know, this is a very difficult, very complicated build and a video series would help so many people. Ultimately, I suppose time spent making those videos takes away from the time spent making money so hey-ho!
On a separate note (apologies if this derails the thread) but still RS related, can someone explain the concept of lineage to me because I don't understand how RS can claim that their stormtrooper armour is the only lineage option?
I know the stories about Simon's Dad, or grandfather or w/e having an original suit but RS armour is not a mould of that suit, correct? That would be recasting which we all know is a sin worthy of exile. So...it's a sculpt based on that armour? So how is it unique to any other fan sculpt?