@Kier As far as I know the TikTok customer support is not able to change the Payment Method or Payment Type. But on my experience (besides this issue) the TikTok support is awesome, actually. Don’t give up, maybe try to change the language of your TikTok Ads Business Manager Website before verifying your payment method again. That’s what helped me in the end. (Changed it from english to german, which is my native language and where I live)
Other things to try:
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adding the payment method with different browsers and devices
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allow pop-ups in your browser (very important)
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try it with Inkognito-Mode
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make sure that your debit/ credit card has 3D verification/ security (you can ask your bank support about that)
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check if everything else is fine with your card (I guess it probably is)
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maybe consider doing marketing on other channels as long as you can’t use TikTok, so that you don’t waste time and then try again later
Again, if I have to compare the customer support of FB and TikTok, TikTok is so helpful and they are willing to help, whereas here in Germany it is even impossible (or at least very difficult) to get help from Facebook at all.