I don't receive my credits

They would be scheduled for the April 12 deposit.

Credits are deposited by the following 15th or 30th of the month after you have at least 5,000 pending. So if you get to 5,000 between the 1st and 15th, they are deposited at the end of the month. If you get to 5,000 between the 15th and 30th, they are deposited
by the 15th of the next month.

Hello,

From the FAQ on Vault Credits:

I claimed Rewards Credits from the vault. When will I receive them?

If you claim Rewards Credits from the MyVIP Vault, they should appear as pending in your account within 96 hours. Once they are pending in your account, the normal deposit process kicks in. Generally if you have over 5,000 Rewards Credits pending in your
account in the first half of any given month, that amount will be converted to your local currency and deposited into your Microsoft account on or around the 30th of that same month. If the Credits show as pending in the second half of the month, that amount
will be deposited into your Microsoft account on or around the 15th of the next month.

Please note you need at least 5,000 Rewards Credits pending to automatically trigger a deposit, though you can request a deposit for the next scheduled date as long as you have 1,000 Credits pending. Also, if you have ongoing issues with us depositing
into your account, such as your account not matching up with your billing location, you might want to consider choosing a different prize from the vault, as we won’t be able to deliver your Rewards Credits until the deposit issue is resolved.

I don't want to get a refund, I just want to receive my r6 credits. Is there a way to do this

If you mean xbox live rewards then you need to post here
https://forums.xbox.com/en-US/forums/4621af49-9b03-45cd-8b43-486891cb05a2_5030e852-0de4-4e1b-bbad-1d4827a65b1a/Xbox-Live-Rewards-Questions

It depends on what offers are running at the time. in order to receive credits, your purchases either have to be eligible for a specific offer on the site at the time, or you need at least 1 star level in order to receive VIP rebates. So you don't necessarily
receive credits for every purchase and credits usually don't show up right after a purchase.