What can my friend do about the delayed marriage process?

My friend from Kanpur is facing a complex situation regarding his marriage to a foreign national girl from a different religion. Despite submitting all required documents, including a birth certificate, domicile certificate, passport, visa copy, and single certificate, all stamped by the Ministry of External Affairs, they are encountering obstacles. The marriage officer is awaiting confirmation from the embassy regarding parental consent, but the embassy has declined to provide such a letter. Additionally, confirmation from the local police station and tehsildar is pending. This delay is concerning as their next scheduled date is approaching, and they fear further postponement. Any legal advice or suggestions would be greatly appreciated.