Banking App - blocked access to accounts

Banking App causing major problems. Its the only access to our bank accounts. Big mistake removing it from previous interface. Now we have no option. App stopped me from accessing my account Friday night. Left it for Saturday thinking it will come right. Tried accessing & changing my password up to 8 times. Uninstalled & reinstalled as per call Centre. Extremely frustrating. Call Centre called back to inform me that they a IT problem and will be sorted out within a hour. 36hrs later ( its now Sunday night) and still no access to my accounts!!