Risk of unauthorized access
Support staff seems neither interested in seeing nor solving a serious glitch in the app: it did revert to making contact less transactions possible even when entering of a PIN was originally selected as requirement!

*** Additional remark ***
Rose's response below proofs exactly my point - they just don't get it! 
It is perfectly fine that customers can easily toggle settings from allowing to blocking contactless transactions. 
However IMHO it is definitely NOT OK that their system/app/whatever reverts from my setting - which was: blocking contactless transactions - to eventually enabling them again _all by itself_ 
WITHOUT my consent!

Thankfully we're not talking megabucks lost in my particular case here. Yet, how should I keep trust in the integrity of their technology - or the bank's integrity for that matter - if they're not even willing to look into the matter and find out how to add layers of security in order to prevent something like that from happening again tsooner or later to me or any other customers whose card might get improperly used by an unauthorized third party?!