What should I do if my Non-O visa has wrong company names and the Thai embassy in Mumbai won't help?

Hello, is there any kind of immigration appeal center where I can go to sort out my visa issues. The problem is that 2 out of 3 Non O visas were issued with wrong company name in India and the officials at immigration in Bangkok are refusing to help.

Me and my kids arrived last month with the 3 month Non-O Dependant visas. The visas were applied at the Mumbai VFS center where I submitted all documents together. My son's visa contains the right company name whereas my daughter and I have been issued visas in the name of the company which owns the apartment building where we reside. Since the company names are written in Thai we were only made aware of this once we arrived here and submitted our passports for the 1 year extension.

The immigration officials here have told us to speak to the Mumbai embassy and sort it out ourselves. The Mumbai embassy so far is refusing to acknowledge any mistake. My only option at the moment is to go back to India and reapply for a fresh visa for us.

Is there any option for us to convert the visa to the right company name without leaving the country or even appeal to the local Thai officials to correct the mistake made in Mumbai.