Weird Dipasquales interaction/ possible scam?

I was alerted by my credit card company that a 32% tip was left on a Dipasquales order I placed, asking if I had left that. The thing is, I was buying groceries and a to-go sandwich at their check out counter. I didn't sit at a table, I didn't interact with any wait staff, and I have the merchant copy of the receipt as well as my regular receipt, and I definitely didn't tip on either of them.

I called to complain, and the woman who answered the phone was immediately helpful. However, a man overheard, I presume in the office, and he immediately said he approved the tip because I had "just left". He then argued with her to justify why on earth he could have possibly done that.

For one, I didn't, I paid for my groceries and left with my groceries and sandwich, all accounted for on the receipt. And two, even if I had, tipping isn't compulsory, and 32% is absolutely criminal even if it was.

The woman who answered the phone apologized and said she would refund the tip. I'm waiting to see if that happens. But I want to encourage everyone else to check their receipts for DiPasquales hard, because it felt so icky and scammy to me. Which sucks, I'm a frequent customer because I think they have great food and great prices.

I just don't want to be robbed by their staff.