touchscreen changing and closing

Hi, I have the Iphone 6, Gold, 16G

worked perfectly until today. I had the screen protection cover placed, and for some reason, all of a sudden, when using whatsap, after every letter the keyboard closed, or the profile of the person I was talking to appeared. It took forever to write one sentence.

I then noticed that when dialing numbers, wrong numbers would appear. I tried by resetting, did not help, and htere again, when entering security code, the phone told me three times the wrong code was put in, and it " accepted" or entered codes without me knowing or aknowledging

Issue remains, and I ended up making an international phone call as messages were too frustrating, but also the phone call menu messed up same way

I have taken off the screen cover, everything the same.

HELP I am abroad, and my phone is my lifeline