Discovery want me to double pay

I ma very disappointed at discovery. I have been trying to reach them and requesting for my membership to be linked with my old membership but discovery keep telling me its impossible to do i must just pay the money i owe for not finishing the year with them. Yet beside switching employees i am still using discovery. rather they made me a new membership which i am paying. This really frustrating as i was joining discovery to avoid such issue only to be milked for money.