totally nonfunctional app

After repeated attempts I keep getting the same message that my credit card cannot be verified despite multiple credit cards. I was told I could not create an account because that phone number was already yet whatever email I put in. It said that account didn’t exist. You click on the app support for Incentivio or whatever, and there’s no option to get help. Because of all this, I’m not going too purchase anything from West Coast sourdough. What a hassle to which I say no thank you.