Citibank Credit Card Complaint

Citibank Credit card department,

Credit line increase/decrease Ohio

I have been making payments on my credit card bill on time and more then the amt due and Macy 's have lowered my credit limit twice. The first time I dealt with it but this time they took all the money I had made and left me with a $500.00 limit and available $29.00. I made a total of $370.00 ( available credit ) and was left with a balance of $420.00 to pay off. Macy 's had no reason in lowering my credit limit. I cancelled my card and will be cancelling the last payment made with my bank. Macy 's does not appreciate their customers especially the ones making payments on time. How can you just take away my money?