I have participated in A block of the month at mt LQS. Bought the blocks finishing kit and backing there. Investing quite a bit of money happily because I planned to usE the quilt as the center of a bedroom remodel. There was quite a bit of fabric in the finishing kit and I have struggled putting it together because I hate two of the fabrics when they are together. I have frequently mentioned to the store owners that my quilt top is not turning out as pretty as the one they displayed in The shop. Recently I finally realized that they had given me a different fabric and asked the owner who finally admitted that half of the participants were given different fabric due to a supply problem said there wasn't any other choice. I honestly think they made an awful choice with the fabric substitution and think I should have been told I was getting something different than what I ordered. Have you had this happen? Am I being unreasonable? I feel duped.

I would complain to them that it was not what they offered in the kit

No, that was presumptious of them to decide to give you another kit other than the one you saw in the store. They should had told you and let you make the choice.

I am kind of anal in what I make for me(color-wise), and I would also complain.

I don't think you are being unreasonable. You wanted what you saw, and they substituted. They should have told you so you could have made the choice.

I don't think you are being unreasonable at all... If it is not what they had in the shop, then they need to find more of what they used in their sample and help you obtain some. That would really tee me off since I have trouble picking my colors and always feel unsure of myself. If this happened to me, I'd think I'd just done my wrong and it was my fault. Glad you were able to spot the "offending" fabric. Hope they can help you get some of that which you like.

That's false advertising.
Or even Bait and Switch.

Complain.

If it says may be substitutions included in package you can't say anything much but if it doesn't then go for it and complain ask for a discount.

At the very least I would expect to be allowed to pick my substitution.

I completely agree!