Upvote:3
You've applied three times in quick succession, with three rejections. You're seeing
There are reasonable doubts as to the authenticity of the supporting documents or the veracity of their contents or the reliability of the statements made".
and
"There are reasonable doubts as to your intention to leave the territory of the republic of Croatia before the expiry of the visa applied for".
The visa officer is saying that he no longer believes your explanations or your intentions.
You appear desperate, and the suspicion is that there is something going on that you're not being honest about. A fourth application now will serve only to reinforce that idea and will almost certainly result in another rejection. The consultants you have approached appear to have decided that you are a lost cause, at least for now.
Give up on Croatia for now. Cancel your flights - you're unlikely to have any success in the foreseeable future. You need to establish credible ties to your home country (an established job, own your own home or long term rental, family and friends) and a history of international travel before applying again. This could take years.
And when you do apply again consider consulting a lawyer with appropriate experience to help you draft your application.