i have screem locks or passwords on all my devices but can someone still fine a way and get in

Aug 13, 2018
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the last three months i'll been having alot of promblems, my acc# have been hacked.facebook said my mobile number isn't mine,when i know it's is.so they removed frommy acc. i changed my g-mailaddress.had no problem changing it on my mobile phone or insignia tablet but having alot of problems changing it on my rca tablet i use the most google won.t let me do it they claim they don't recognize anything i have and that's a first.