App malefunction – Drop: Shop Cash Back & Rewards Review

I’ve been racking up the points for several months, but all this info has gone missing. The only option I am given is to sign up for drop. When I try to do that (because starting over is better than nothing) I am told that my identifier info is already being used. Please fix. Please tell me what to do. Thanks. Judy Endow
Review by jjjjj because judy is taken on Drop: Shop Cash Back & Rewards.