[silo2020]

Really sorry to hear this, but you're screwed. I had a similar situation and was totally ignored like you are.

My only way out was to let the card expire (thankfully, in my case, it was just about to) by totally ignoring the flood of 'renew now or we stop the paid services' emails.

Letting the card expire stopped the charges but also shut down my GC services. I had used the time to migrate things off and abandoned anything that was left (like maps API).

A chargeback will end up with the vicious blocking and deleting of your gmail and everything else you have with Google. If you're going to do that, backup/offload everything you can first as it's all going to be crispy fried by Google the moment you do the chargeback.

Never use Google for anything important that you cannot afford to lose at a moments notice.