App very frustrating

<p>I have had issues with my app for months (on different phones so not the phone that is the problem). I either try putting the app on my phone or it suddenly stops working. Every time I go in they assure me that it is registered, so not needed to come in. Yet without fail I have to go in every time to sort it out. How do I go about putting the app on my phone or sorting it without coming in every few weeks. It becomes very difficult to do anything without having to go into the bank (defeating the object of having the app) </p>