Good, very good you are making some plans.
Finances for payment of fees, it was a rhetorical question, that is I don't need to know if you can afford to pay your fees nor do I care if you afford it. But you disclosed that you have no problems with that, good again, that is a bonus, one less issue to settle in your pursuit of your MBA.
Your goal of taking the MBA:
no promotion (they will still want to look at the certificate in order to promote you further) and
don't earn much (What I've been doing, doesn't earn much)
no promotion: A degree will definitely help, consider a bachelor's degree as well as the MBA.
don't earn much: Having a higher degree does not necessarily means making more money. There are other avenues of making good money, certain skills or trades (that is if you do not mind a non-office job) can pay more money than a university graduate.
Enough of me, I have no answer to your original question for now.
I will let others answer your question.
So, anyone has any idea regarding recognised online MBA that accept Diploma holders, please let this lady know.
Thank you for your help and kind advice.