Refund of lawyers fees due to incomplete work

I went to one lawyer for filing divorce case, but I was advised to file maintenance case, divorce case and child custody case, fees was 3.6 lakhs for all 3 cases. However later I was advised by the same lawyer to file only divorce case and child custody case. Advance was 50,000. But the draft is still not ready, agreed filing date is also over and 1 week delay. No positive response and simply dodging for some reason. Lawyer says no need to file the maintenance case as divorce case itself is sufficient for claiming maintenance. Now I want to get refund from the lawyer as the worknis not done as per the agreed date. How should I approach the lawyer for getting my money back as the work is incomplete and also approach is not satisfactory.