Can’t use my Apple credit card

It’s been five months and I have been unable to use my Apple credit card. I accidentally deleted it from my wallet ever since then I haven’t been able to add it back nor use my card. When I attempt to add it back, it says invalid information. I’ve done all the troubleshooting change the region changed the back, etc. It’s gotten to the point that when I call I know the troubleshooting techniques before the agent even says. I’ve called Apple and Goldman‘s at least 20 times with no results. They keep blaming each other. I’m at the point of counseling my card. What’s the point of having it if I can’t use it?