Wrong Number on Account

I have phoned FNB 6 times in order to get my phone number removed from their system and all they reply with is that my number does not exist on their system.<br> Someone has given my cell phone number up as their contact number and I get spammed with all of the inContact messages for that person, from deposits, withdrawals, card collections to ebucks pin and login password. <br> FNB never phones me back or follows up on this!<br> <br> I have even taken screenshots on my phone to show that I am receiving the sms's but still I am told FNB does not have my number on their system.