What is a Mutual Fund 12B-1 Credit for?

I know that 12B-1 Fees are charged with some Mutual Funds but I have been getting credits for them and don't know why. Any Help?

Maybe I need to know when you actually pay these fees

They are credits because you've paid them and the Mutual Fund company apparently has decided to lower the 12b-1 fees as such you are entitled to a credit (read: refund) of the fees that you have paid

You pay them daily.

The funds that charge these fees deduct them daily from fund assets.

12b-1's are often referred to as "sales and marketing fees". Why you would be getting credits (I assume that you are referring to refunds) I have no idea. I would call the company and find out because I can imagine they might be making a mistake and then will want their money back.

A provision that allows a mutual fund to collect a small fee from investors. This fee is designated for promotions, sales, or any other activity connected with the distribution of the fund's shares. The fee must be reasonable: 0.5% to 1% of the fund's net assets, and up to a maximum of 8.5% of the offering price per share.

Originally the 12b-1 fee was thought to help investors. It was believed that by marketing a mutual fund its assets would increase. This would ultimately lower management expenses because the cost would be spread out among more investors. However, like the Loch Ness monster, this has yet to be proven. Most of the time the 12B-1 is just a way for fund companies to impose hidden costs on investors.

Most mutual funds with 12B-1 fees in excess of 0.25% are classified as a load fund