I wrote to cancel my automatic subscription of LiftSP and sent my letter to the address on the contract. It was returned to me as undeliverable. I verified that I had, in fact, sent my letter to the address listed; PO Box 1158 Pleasant Grove, UT 84062. I also tried to cancel my order on their website as outlined in the contract and it kept rejecting my request to cancel. The product is worthless and I do NOT want any automatic shipments. read full review »