Will i still get my refund even if i got a 4464C letter?

The letter may request additional supporting documentation, in which case you should provide that. In the meantime, they're allowed to hold your refund for up to 45 days while they check into it.

You should eventually receive the refund you are due, which may or may not be the refund you thought you were getting. A 4464C letter basically says that the IRS is holding onto your refund while they investigate your return more thoroughly.

If the investigation shows that you should get a smaller refund or that you actually owe the IRS money, then you'll get a smaller refund or none at all. You may also get a bill for the amount due.