Hello Misha,
Yes,the contact information in admission pages are to clear the queries of all.Almost every college has an admission cell and in those cells there are people appointed to deal with the admission procedure.So they are there for admission guidance and it's completely fine to call on the given number,send a mail on the given e-mail ID or visit the admission cell of the institute as per the given address.

They are also a very important part of the university website. They are present over the same because if a student needs help a bit soon he/she can go and ask for it. It is present for solving any query of the student. They are really for admission guidance as they help you in different processes of admissions be it fee, department,lodging etc.
Yes it is OK to contact them.