mojang account

I was setting up a mojang account on a surface and I asked my Mum to put her credit card details in but she didn't want to do it at that moment. So I turned it off and put it on charge. The next morning, I discovered that the surface had been powered off. I powered it on and tried to sign in, but it said that there wasn't an account with that email, so I tried to set up my account again, but it said that there was an account made with that email and told me to sign in.