Frozen bank account

This is already a second complained. Tuesday 25 January 2022 when I wanted to use my card, my account was frozen. Fnb cant gove me a reason and said that they will look into it and contact me within 24-48 hours, they never did. I lodged a complaint on hellopeter, after which I received a call to say they are looking into it. It is now nearly a week. Nothing yet. I cant even pay my house because I cant get into my account. How can my account be frozen without letting me know and without fnb knowing why????? Worst service ever!!!