Contacts were extremely back ordered, like five months nearly, which is the suppliers fault. Clearly resolved the issue, and their staff was excellent.
My suggestion is to rework your stock tracking system or whatever CEM system you're using to not allow clients to order back ordered contacts. It's fine for a t-shirt, but I had to wear the same lenses for five months, which I don't think was advisable. It didn't need to happen, and was entirely preventable by live stock tracking.