Vaghela, the Leader of Opposition in Gujarat Assembly, made the promise to the jailed Patel quota leader Hardik Patel in a letter, circulated to media by the latter's lawyer Yashwantsinh Vala.
Hardik, in his letter on May 11, had asked Vaghela to give a definite assurance about the EBC quota after the Congress demanded that government double the quota and raise the income ceiling to Rs 12 lakh from the current Rs 6 lakh.
The Patel community had launched a violent agitation for OBC quota last year.
Vaghela, in the letter, also accused the BJP government of holding a grudge against Hardik and other Patel leaders who are languishing in jail in a sedition case.
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The people will give a fitting reply to such arrogance, he said.
He was putting Congress's support for 20 per cent EBC quota demand out of "moral responsibility", said the letter.
The letter also praised Hardik for showing "immense courage".