FNB's highhanded and abusive conduct

I received an sms to update and confirm my personal details within 24 hours failing which my card would be cancelled. I followed the link and did the necessary until I got suspicious that it might be ***** since I had no assurance that it was genuinely from FNB as it required my password and pin number. I stopped halfway. Within a minute I received a call from an FNB consultant who was rude and threatened that I must complete it or my card will be cancelled. I explained that I was suspicious and he was not going to force me to do it. He then immediately proceeded to cancel my card along with an sms from FNB that my card has been cancelled. "Please destroy it as it is no longer active". I've tried to contact FNB but only get automated responses that lead nowhere. I've never been treated this rudely and badly by a company. This is an absolute disgrace!