The store says some customers who used debit cards on the Saturday before Christmas, got double charged.
The billing problem happened between 1 p.m. and 2:45 p.m. on December 20, 2008.
A Macy's spokesman says the problems have all been fixed. So your account will be credited if there was a mistake.
If the double billing caused an overdraft in your account, you should contact Macy's. For more information, visit their website.