I have the same problem in the store. I don't use credit cards, only debit. I asked the cashier what to do to run my debit as a credit, she said to not use my pin, but every time it runs as a debit. For Dosh to credit, I have to take a picture of my receipt and put in a request. They told me they will ALWAYS credit me my Dosh $ even if my transaction gets run as a debit. I just have to do that added step until I can figure out their system.
I use my debit at our gas station every time I fill up and it never puts a hold amount on my card, just charges me the amount I bought.
Yes! Even when I ask the cashier to run as credit, it still comes out as debit. Sam's is the only place I have this issue.