parents dont agree for marriage on the basis of caste

aoa. i am a practicing muslimah, and I want to marry a practicing muslim boy from a good religious family. i talked to family about him around 2 years ago and they refused to even meet them because they are not from our caste. we are syed and they are malik. he and his family respect us a lot and have tried to meet my parents but my parents refuse. i know i cannot marry him without the permission of my guardian, but when the case is like this that they are refusing on the basis of caste which has no importance in islam, what can I do? in this case can I get someone else to be my wali?