Such is life when dealing with the public. Some people will need individual attention. They may well cost you more than you make from them. You make it up with the averages. If you don’t like it, don’t sell to the public.
Your local grocery store has far better customer service than this despite razor-thin margins. Payment problems? They’ll work with you. Product is bad? Refund. Sale not ringing through properly? They’ll fix it. Surely Google can afford to have some actual people to help you when you have problems.