Cancel Contract problem!

I made contracts a while back with my corps that produced conventional and cruise missiles. I canceled them when I didn't need to produce them anymore but every month the contract starts again. the contract says "repeat every 1 month" but I just don't know how to completely cancel it since I cancel every month with obviously no results.

they cant be sold on the market so they automatically sell to your strategic stock... ethier find contracts to give away the weapons from your strategic stock.... send all the excess production to another country through monthly contract or cancel the corp