Lost Access to My WhatsApp Account: Request for Ban Review

I have been using my WhatsApp account linked to the number 9350014*** on an Android phone for about seven years without any issues, only for personal communication. Around three days ago, I suddenly received a message on the screen stating that “This account can’t use WhatsApp” and that my number has been blocked due to an alleged violation of the Terms of Service. I believe this is a mistake or a misunderstanding because I always try to follow WhatsApp’s rules and I do not use any unofficial applications, spam messages or any misuse. I was very surprised and upset to lose access to my account after so many years of use. I kindly request that my account be reviewed in detail and that my access to WhatsApp be restored if possible. I would be grateful if you could reactivate my account or at least explain clearly why it was banned.