Is your pharmacy closed on Sundays?

If not, the same effort you spend calling a doctor at a hospital can be spent calling the pharmacy to fix your problem! That is typically how things like this are settled.

The pharmacy will GIVE you the balance you are short. (they do not bill insurance, since that was done already).

If you get a new RX, and take it somewhere, instead, and they try to bill it Monday, it will still come up TOO SOON based on the days supply the insurance computer is reading from the last fill. The fix has to be done at the pharmacy where the problem is occurring. I think you will just make the problem bigger and more confusing if you go the route you claim.

If your pharmacy is closed on Sundays? When you get the new RX explain when you take it in, that an error happened and this is a replacement. The insurance computer will deny the early refill, and then that pharmacy will have to manually call them for an override--correction, and that takes time, and you may have to wait for that approval. It is much easier to fix this with the pharmacy in the first place.