How long does it to process a refund invoice to work?

The internet banking system for my credit card company still shows that I should pay for thoses mistakenly purchased invoices (538579,538580,538581) which were cancelled on your part. My account information shows that your published refund invoices for them (respectively 538635, 538634, 538633). Because the total amoun is not small, I am worried about if the cancellation for the invoices are on the process. Please let me know if you are properly working on them. Thanks for your kind support in advance!