I bought $50 worth of ads using my credit card. My account was immediately suspended for suspicious payment. I appealed, noting the card was mine, and I bought the ads. The appeal was rejected.
I have occasionally tried to resubmit the appeal, but it says "please wait 3-5 business days before submitting a new appeal." I wait more than that and get the same message.
I've called Google to try to talk to them. However, once it asks for my contact information, it tells me that they cannot talk to me because my account is suspended. It's a circular nightmare.
I currently do not needs ads so it's not a hardship. But it is extremely frustrating.
EDIT: One irony is that it is the same card I use to pay for my other Google services, linked through the same payment backend. They have no issue charging that card for my other services. But for Ads, it's suspicious. Who knows.