It seems you're going to have to wait out your ban.
India is on the list of visa countries, and isn't on the list of visa on arrival ones. This means you have to have one, whether an eVisa or a sticker. Having a Schengen visa makes you eligible for an eVisa but doesn't exempt you from needing one.
It is possible to appeal the decision, note however this could take longer than your ban period, depending on procedure.
HOW CAN I APPEAL IF MY APPLICATION IS REJECTED?
Appeal against the rejection of the visa application is made firstly by applying in writing to the agency who refused a visa. If not receiving a positive response, it is possible to apply to a court for appeal. However, the country is open to judicial review of the visa denial are not outnumbered. Also, often time-consuming court process likely to result in the end of the court against the state is weak. Another important aspect, it keeps open to the objection of a state of law in the judicial visa applicants, this case will be looked at the court of that state. Therefore, it is necessary to keep a lawyer in the country.