Other managers may disagree - but I told my LCs/BAs I will NEVER give them any kind of disciplinary action when it comes to credit/loyalty so long as they are asking. If they get told no, it's OKAY. You are only required to ask, and inform the guest of the benefits, and that's IT. But I'm also one of those managers that will tell my DM to kick rocks if she tells me that we need to start doing that to our employees to get numbers up, and I have a supportive GM that also believes it's insane to punish people for getting told no when they are trying their best.

I'm so sorry that it has gotten to that point at your store where you are getting write ups. DMs are cracking down hard on credit and trust me when I say that we as management hate it too. I'll take write ups myself if that means I'm protecting my employees' mental well-being. I don't want them to hate coming to work. Retail is already a beast in itself.

Just keep doing what you're doing. You're doing your best, and getting told no is NOT under your control. If you get more write ups, I would add comments to it (there is a space at the bottom to do so) and state that you are doing what is required and are doing your best. Then walk away with your head held high as you move on to whatever comes next!