The decision has been made, and only thing you can do is to apply ( and pay ) again.
Next time apply with the full amount on your own personal account, no doggy sponsoring.
They wan’t to know you are an adult person, that can handle things yourself
Why dont you read the embassy website thoroughly before applying there are important information to be found both there and in the manual on the e-visa website top right corner.
Most DTV requirements are Embassy dependant, so first choose where to apply from, and remember you have to stay there during the WHOLE visa processing time.
Not married = separate application, separate bankaccounts.