Help! How can we "un-delegate" Steem Power?

The Issue

I've delegated 200 Steem Power to minnow support project, an awesome concept I totally believe in. My delegation entitles me to an automatic upvote by Hive account@msp-lovebot. HOWEVER, the upvote has never worked for me 😢. Not once...no idea why.

My username even shows up in their list of supporters, here's a screenshot.

For whales or even "dolphins"* (see bottom), 200 Steem Power might not be much, but it's over half of my total - a big deal for me!

My Question

How do we take back our Steem Power? I'd imagine this would be simple and straightforward to figure out, but I couldn't find any instructions for this on Minnow Support's page.

The delegation page even states:

"you retain control, and can always take it back at any time should you wish — this process takes seven days"

What I've tried

-I checked with my "know-it-all" buddy Mr. Google... he didn't have any luck either 😂

-I recently asked on one of Hive account@uwelang's related post - he said he wasn't sure, and Hive account@public-money suggested I reach out directly to @minnowsupportproject but I couldn't figure out how to do that either. CC'd them so they can see the answer here, which some helpful person will hopefully tell me 😁

-I was able to get through to Hive account@sammosk , one of Minnow Supports' moderators. He (or she?) responded right away and said it was fixed, but it still hasn't worked after that.

As much as I love Steemit, I must admit some basic functionality is tricky to figure out.

PS - It would be ironic if this post was actually upvoted by Hive account@msp-lovebot. I really hope it is! Even then, I'd still like to know how to un-delegate for future reference.

*Yes, you heard it from me first... we need a term for mid-range users between 45-65 or so 😝 I suggested this in a post by Hive account@hustletoparadise - shout out! :)