Small context before continuing, one week last month I was scheduled for a few cart attendant shifts (our main cart attendant was on vacation). I wasn't asked in advance (or else none of this would've happened...), found coverage for 2/3 of them, and had legitimate reason to call out of the 3rd one (dental procedure right in the middle of the shift). Calling out was not something I wanted to do ideally because I felt guilty and bad about it, but I explained this to the LOD twice on the night before the shift (my direct Sr. TL) that I wasn't able to be in for the shift, so that I wouldn't have to wake up at 8AM just to call. She understood and said she'd put it in the closing e-mail so I'm not marked as a NCNS, and that was the last I heard of it.
Fast forward to today, I went to talk to my ETL-HR today asking if I could be given hours in Market because our market team is going to be losing 2 people for college in the next month or so, and the market team already is desperate for more people regardless. He told me I NCNS'd on a cart attendant shift last month and that was an automatic Corrective Action (I was never told about this CA...) and that one single NCNS (first and only time in 4 years of being with Target...) completely proved I was unreliable, and that neither he nor my direct ETL will give me more hours because of it. At this point, I'm convinced they're only giving me 1 shift a week because they have to, because it's obvious to me now that they dislike me for unfair reasons.
First of all, it was not a NCNS. I went out of my way to tell the LOD the night before to ensure this would not happen. Should I go in tonight to talk to that LOD in question so that this is sorted out and the CA is removed? I have done well at ensuring I've never had a NCNS or Corrective Action on my record and I find it extremely unfair that they're pulling this as an excuse to not give me more hours in a department that desperately needs it. Would it also be worth talking to the Market TL anyways to see if he would back me up to HR that I'm reliable and worth moving to Market (I have always had a good rapport with him)?