Vasectomies aren't guarenteed. This is why the term 'proven vasectomised hob' exists. Plus if the hob is used too soon after the op, there is a high chance he will impregnate the jills! If the hob was operated on in Feb and you used him soon after, then yes, you would get pregnant jills! Either the vets didn't explain the post-op outcomes to you or you didn't listen. If I was in the same situation as you, being given a full refund for a vasectomised hob and the offer of a free vasectomy on another hob, I wouldn't complain. I'd just use enough common sense to not use a recently vasectomised hob