Without ANY question, if you're UNHAPPY, demand a NEW tub.
One thing that really BUGS me on this forum is the number of people who seem to have MAJOR problems with their $7,000 to $10,000 spas. I'm sure there are lots of others out there who don't, but the ones that do need to demand IMMEDIATE satisfaction, regardless of what reasons are given for the problems. If the dealer is solid (like almost all the dealers who post here regularly) they will do what it takes to make you happy.
Elle, if you bought a top of the line side-by-side refrigerator at BestBuy for $3,500 and, after it was delivered, the control panel didn't work, the ice maker hissed loudly, the shelves kept falling out, the motor could be heard in your bedroom, and the freezer worked only half the time, would you be happy if the GE repair tech came out 3 or 4 times and said, "don't worry, we can fix it?"
I DON'T THINK SO!
Do what it takes to get satisfaction.
Good luck and, if I can help, post back or PM me.
Drewski