What can I do if the reviewers' comments on my manuscript are not correct?
Whether they are right or wrong, the editors are in control of what they will publish and you don't have any control over that. You aren't likely to be successful with an argument with them. 

You have two options, at least. One is to change the paper so that they are satisfied with it. The other is to try to publish elsewhere. 

However, I will guess that the comments of reviewers aren't as invalid as you think they are. Even if you decide to publish elsewhere, you should go carefully through your paper with the views of the reviewers in mind and see what you can do to make it better. 

No one is required to take all of the advice of reviewers, but generally, they are expert in the field and so have valuable things to say. You don't need to respond to every advice, but you should, at least, consider every advice. 

Among other things, I wonder why they suggest a co-author. Is there something in the paper that suggests that it would be appropriate, or are you in a field in which sole authorship (especially by students) is rare? 

And don't take the comments personally. They aren't criticizing you when they have doubts about the paper. They are focused only on the work itself.