KOHLERK-1165-S1-0 Sunward 72-Inch x 42-Inch Exo Crylic Drop-In Bath with End Drain, White

Purchased from big box store as an under-mountable tub. Framed tub in only to figure out the template and instructions cover drop in installation. Contacted Kohler to find out the instructions to under mount were an additional $56. No where was this stated where I purchased the tub nor was it stated here or at Kohlers web site. Now I have to pay my contractor to start over thanks to Kohlers deception.I'm sure that had it been purchased from Amazon the issue wouldve been resolved but Kohler basically told me tough #$%@

This needs a drain, got same thing with drain at efaucets with drain