Ex says he should take child care credit because he pays child support, but I pay the daycare bill-ALWAYS?

Who is right? I pay the daycare for both kids and receive the 1099. I signed the form 8332 but that only gives him the exemption for ONE child. I took the daycare credit for BOTH kids since not only do I pay it but I also run $5000 thru my cafeteria plan at work. In addition I took the EIC for both kids this year; however I did not claim ONE child as an exemption (due to form 8332). Ex says he is calling IRS. I paid the daycare I took the credit - simple as that, right? Also in the past I didn't take the daycare credit for both because I didn't think I could. He told me he had been taking the daycare credit for the other child - even though he never pays it directly to the daycare. He only pays me child support. Any advice?