This is how to approach this problem, then.

Take your bottle with that newest refill date back to the pharmacy and explain you are short.

They will count the days, you are short and give you the pills you are missing only... they should do this as a courtesy. It happens, people miscount.

On medicaid you'd normally get a month's supply. If your doctor wrote for a different # of tablets, that may have caused the short. Or a typo when entering the day's supply into the computer. Or a miscount. Or they ran out and forgot to give you an owe slip? There are several levels where this type of thing can happen. For a patient who has never brought a short to their attention before, a reasonable pharmacy will give you the tablets you need until the next refill date is due.
If your doctor did NOT write your RX properly, they may have to call him/her to correct that error and change the RX ..this may result in a new order and new refill number.

Seizure meds are important, and I don't know of a pharmacy that would not correct this situation in some way. You have to talk to them, and take your empty container with you when you do.