You can join MBA from IGNOU only if you have a Bachelor’s degree with minimum 50% marks. A diploma or post diploma alone is not considered equivalent to graduation. With your 29 years of rich industry experience, you may explore IGNOU’s PG Diploma in Management courses, which are open to diploma holders. If you wish to do MBA, first you need to complete a graduation degree through distance or regular mode. Alternatively, you may also look at Executive MBA programs from some universities that consider work experience for admission.