I run a small business and have been saving for some time for a piece of machinery (that costs 4 figures) and is meant to be The Best at what I do. I am not new to this sort of machine, having used cheaper versions for the last decade, but this represents a significant upgrade in quality, ease of use, and functionality.
I bought one last week after emailing various companies that supply it. I went with the company whose engineer/technician I exchanged several emails with and seemed very knowledgeable and prompt with replies and information. They offered a good after sales service, telling me to contact them and they would help me with any issues.
The machine arrived last Wednesday, I set it up, had a fiddle and some testing and then started to make one of the items I sell. It started off well but when it came to the last few steps it was a disaster. Came out damaged and unsaleable. I spent the whole of the next day making test runs, changing settings etc. I emailed the supplier immediately to show photos of the problem and ask for their advice (which they had said they would be more than happy to give). They didn't reply!
I've joined forums and Facebook groups for users of the machine (or others in the same brand) and found several people with the same issues, and got various tips that have helped a little but nowhere near solved the problem. I've been suggested to try various different attachments, 2 of which I have bought and tried and have not helped, the 3rd one is nearly £100 and I'm loathe to spend more money just yet. Especially when this machine is meant to "just work" and makes claims that IMO it isn't living up to 
I've now spent days fiddling and trying to get results similar to what I know is achievable with my much more basic older version. No joy. I cannot sell the items this new machine is making, my customers would be returning them as nowhere near my usually quality of work 😓
I emailed the company again yesterday to say I was still having the same problems and could someone please contact me.
But if they don't reply fast and with some advice that actually helps, will I be able to return it as unfit for purpose? I don't know if it is faulty or not, because it does some steps of the job I bought it for perfectly but then completely buggers up others. But it is certainly unfit for my purposes unless the supplier is able to troubleshoot for me.
I'm so upset at the thought of wasting this money on something that I cannot use!