Asking one's hajj agent for what was promised in the package

I am planned to perform hajj for 2020. I am told by my friends that if the agent does not keep his promises about what was explained to me about the packages, it’s haraam to question him.

My question is, I am paying the money as per the package so why should I have no right to ask him why he is not keeping his promise as per the package? Also, if no one asks him about it then he will keep cheating every year.

Please let me know if I have my right to ask him or it’s a sin to ask him.