Poor customer experience

At the very beginning I had an exceptional experience with superblist. I even recommended to a number of people. It's so unfortunate that as I intend being a regular and valuable customer, the app delays my every payment until I lose the list I have on my cart. I consulted my bank and everything checked and all is well. Shockingly superblist app still does not accept my payment on the final confirmation. Can someone please do something about this, urgently or else shutdown the app if it's not as trusted one.