It seems there are many Bitcointalk members who use TradingView. So I think the problem is the tradingview system detected that you are using fake debit/credit card or you are using prepaid cards(Visa/Mastercard) or maybe they detected that you made multiple accounts.
And actually the weird thing is they only offering 14 days trial, not 30 days. How did you know that they have 30 days free pro trial?
But if you are using real debit/credit card try to contact them instead tradingview.com/contacts/
Maybe the issue is from their system that detected your PC or card as multiple accounts which are not allowed to abuse the free trial.
+1 to all of this.
I think it's fair to assume that something like TradingView is probably going to be getting a lot of traffic from economically depressed areas, and people are going to use fake debit cards on their website (or cards with only $1 on them to avoid the next charge if they forget) The biggest way for these companies to make money is to get people to forget that they're on their free trial, and to charge them. But when you're using something that stops that from happening they're not going to be happy.
But yeah, don't abuse the free trial on there. Not notice and I assume thats what they think you're doing.