Amden Corp Purchased because of lifetime waranty, when i called to replace they said the waranty is only if i kept up monthly deliveries of brush heads San Juan Capistrano California

i purchase several cybersonic tooth brushes for the family several years ago. i signed up for the monthly shipment of brush heads which i recieved for several years. I purchased these brushes with the appreciationof a lifetime waranty. when i moved the brushes stopped coming and now that one of the brushes  head broke i tried to get a new one under its lifetime waranty to my supprise the waranty is only good if you keep paying for brush heads. it sounds like you would be paying for a replacement brush with the continuation of its replacement head program, which of course is not explained when i purchased the 5 cybersonic brushes. so i am now looking to find a company that sells a better brush with a better waranty.