If they told you that you could get the Go-To later and then said it could not be purchased, then they have violated the contract with you on the sale. I would tell them that the purchase was based upon their telling you this and that you would like them to refund you money or let you exchange it (with a credit) for a scope that did have Go-To capability.
Floyd
Floyd
[SIZE="Large"][/SIZE][COLOR="Blue"][/COLOR] Floyd Blue
Amateur Imager