I have an odd filter size in an older home and it is so easy to order with filterbuy rather than running around to different stores to try and find my filter size. I've been buying from them for a few years now and I wouldn't go anywhere else for filters.
I have submitted multiple inquiries online to refund/exchnage for correct size and it's been weeks and no response. I will call them, but that's really terrible that they can't respond to a simple request.