Yes, Institute of Distance and Open Learning - University of Mumbai is more expensive than Softkey Education and Infotech Ltd. Here is a comparison of their fees based on the available information:
Institute of Distance and Open Learning (IDOL) - University of Mumbai:
B.A. (F.Y., S.Y.& T.Y.): INR 5,49

Above is the fees of MU 

 Softkey Education and Infotech Ltd, there is no information about the fees structure on the website, so you can collect the information about that and then compare which is more expensive.