should I file contested divorce if i need divorce?
If you want divorce, you immediately file divorce case and get it tagged with your husband's RCR case, so that both can be disposed off simultaneously.
Do I have to appear for section 9 case?
Yes. As it is pending you should. As suggested above, get your divorce case tagged alongwith his RCR so that for both the cases, you can appear same time.
Can I re-open section 125 case against my husband?
Yes. And you should. Your statement in MCD that you are not intended to have maintenance has no bearing for the reason that MCD has been withdrawn by your husband and it is not binding on you.
Can I demand maintenance from husband during until divorce is given?
Yes. You can demand. You can file Section 24 application in his RCR or Secction 24 application in your intended divorce case, but the latter is preferable for obvious reasons.
Above all what are all the legal options for me since my husband is not agreeing for MCD now?
The trick is that even if he succeeds in RCR, one year after RCR if you file divorce under Section 13(I-A)(ii) of HMA. You ask your advocate further on this point.