IGNOU - Indira Gandhi National Open University

Yes, you can apply for the MCA course at IGNOU. If meeting the eligibility criteria as given below.
Eligibility: Any Bachelors's degree of minimum 3(three) year duration from a recognized University AND Mathematics as one of the subjects at 10+2 level or graduation level; else the student is required to pursue and pass the BCS-012 course concurrently with IGNOU MCA.
If you had studied Maths at +2 or graduation level, then you need not register for BCS-012.

For doing M.A. In economics, the candidate must have completed graduation with a degree in B.A. In economics with minimum 50% marks.

Communication, digital marketing could be few good option. You can also pursue MBA in marketing or online course in communication from MICA through online learning platform like upgrade.

The eligibility criteria of MCA of IGNOU is given below. Eligibility: Any Bachelors degree of minimum 3 (three) year duration from a recognised University AND Mathematics as one of the subject at 10+2 level or graduation level; else the student is required to pursue and pass the BCS-012 course concurrently with IGNOU MCA. If you had studied Maths at +2 or graduation level, then you need not register for BCS-012. So from above because you have studied the Maths at graduation level so you are eligible for the asked course.