Just out of curiosity, what did the dealer void your warranty for? As far as I know, they can only deny warranty work if you did something to cause the failure. That doesn't void the whole warranty. i. e. you remove your muffler, and the transmission goes out. These aren't related, so the dealer should honor the transmission warranty. But he won't honor the warranty on the exhaust system. I was also under the impression they have to prove whatever you did was the cause of the failure. As far as the refund on the extended warranty goes, you should get a full refund, because you aren't into the ext. warranty period, yet. Refunds on extended warranties are pro-rated by mileage, and time. At least that's what every ext warranty I've ever dealt with has said, along with the warranty "salesman". Harley's warranty doesn't work the same as most car dealers, from what I read of it.
Jim