Fuses And Circuit Breaker problems of the 2015 Toyota Prius

Within a 6 day period, the main 12 volt battery died and the car which was only 3 weeks old would not start. Also the cable used to charge the hybrid battery trips the circuit breaker in my house each time even though it is a ground fault outlet and a 20 amp breaker. I had to call out a tow truck to jumpstart the battery both times. Car was parked and directions were followed exactly for charging it. I took it to the dealer who found nothing wrong and was told I should have a dedicated line to charge the car, even though I wasn't told this by the salesman. The electric service in my garage in brand new. This is ridiculous to go to this expense and not be told in advance, and to have a new battery need charging. It had to be charged before I could even test drive the car but that did not matter. I was told I could not get a new battery as it tested "good".