Colleges in Chhattisgarh

I would suggest you to go for IIM Raipur as IIM brings with it self a brandname and should always be preferred above the others.

You have to contact your university administration block to verify your degree.

You can get a Diploma certificate and then apply to the particular university.

Yes, university is valid for pursuing PGDCA. The University recognition details are given below.
1. The University is recognised under Section 2 (f) of the UGC Act.
2. Other recognition include AICTE, NCTE, BCI and DEB.
3. It is the first University in the state of Chhattisgarh to be awarded an ISO: 9001-2008 Certification.
4. Membership of the Association of Indian Universities (AIU)
5. NACC B+
6. NIRF Ranking Under Top 200 University
PGDCA is 12 months duration distance learning course and the eligibility criteria is Graduate in any Subject. So you can pursue the PGDCA course. For more details please see the 2019-20 prospectus.