TIL: Auto-refill on the MC consumables doesn't refill from the heap you've got in inventory that you've won from all the giveaways, it deducts MC after the first one is used.

Fortunately I only used it a few times. I thought I'd use them as I had quite a lot of Advanced UAVs from the giveaways.
I assumed it would only deduct from MC when the inventory was empty, so was keeping an eye on the stock and watching my credit balance sheet on my profile which let me spot it in time.

Also, with learning that the PTS go-live will net me about 1.5k MC I think I'll hold on to them rather than use them up just because they're there.

Edit:
So I did some sciencing, and MY MC values have not changed, I've used MC consumables that I had stocked.
It would appear that there's a miscommunication. Will be working more to find out why.
http://i.imgur.com/0AYbNPU.png

Edit 2:

From GM Patience

GM Patience (Piranha Games) Apr 26, 14:40 PDT

I owe you an apology as I've made a mistake with my previous response. You will be only charged MC for the consumables when you don't have any of those available in your inventory and you've previously selected the auto refill option. As you have been charged for ADVANCED UAV back in March it means you didn't own any at that time. I see you've redeemed 4 of those back in March, consumed them, and then have been charged as the auto refill option was selected.

Redeem 01:16:06 AM UTC - Mar 20 2017 ADVANCED UAV Redeem 11:49:54 PM UTC - Mar 19 2017 ADVANCED UAV Redeem 11:49:54 PM UTC - Mar 19 2017 ADVANCED UAV Redeem 04:12:13 PM UTC - Mar 19 2017 ADVANCED UAV

It runs out I'm an idiot for letting it overrun, but there was some confusion from PGI when I questioned it.

So if any mod is listening, flair it up as a user error or something please.