Unreasonable/improper exercise of contractual power

I opened an account with FNB SA as a foreign student studying at UCT and they just sent me an email from nowhere saying they were exercising their contractual right to terminate their relationship with me. No reasonable explanation was given for such exercise of contractual power. It unjustifiably affected my universal right to human dignity and 'felt' like unfair ************** on the basis of my nationality. I enquired from friends if they had suffered a similar predicament and that was not so. I feel like I was singled out and made out to be some sort of ******** undeserving of having an account with them. I am an honourable man and I have no ******** record to my name and intend to keep it that way. I went to my branch to enquire and they could not give me an explanation. I was told to send an email to some address and I did and never got a response. They created a reasonable expectation in me that I would be banking with them through out my studies and opening another account with a different bank was definitely an inconvenience as I had just come out of two weeks of extreme stress from end of semester exams . The whole scenario caused me a lot of stress as I was unsure if i had been blacklisted and for what?The bank failed to give me an explanation and that was extremely disappointing and appalling coming from a bank held in such high esteem. This is definitely not defamation as there is no lie in what I am saying. Goliaths like to throw around that word to incite fear in victims like myself.I feel victimised.