Affiliate Marketing Secrets

I sell products online as a affiliate and ive been paid for over 2 years from this company and the company was very greatful, paying on time, and saying thank you, and so on.. Well this month after 15th I got a email that my payment was Processed and shipped to my address. So i have the Reciept with a Check #.
Now its been a week and i email the company, and they inform me that my account is terminated as of 1/22 Now my check was issued 1/15. Before i was terminated. In the policy it states You cannot hold there company to any losses, and anything. But in the same contract it states, if you advertise for them they are required to pay you a commission. Nowhere in the policy does it say they can hold you funds. I would understand they could hold anything made after termination, but the check was issued, but never sent .. and i was terminated after the pay date..
They acussed me of taking possible clicks away from them (sales) when im the one who created the ad on bing/yahoo.com The pay per click / strategy was 100% up to policy and apon Signing up for the program 2 years ago all this information was given apon signup and i was given the GO.
With all this information it will possibly throw off my 1099’s now because in the backoffice it says I WAS PAID for that month yet they did not pay me.. The guy will not answer me and i provided all evidence of my advertising 100% up to policy, i just think they dont wanna pay me.
What do you think? i appreciated anyone taking the time to read this?