Since the flat is in your name and you paid the amount you are owner of the flat further file an injunction suit on the property and give a notice to him and in newspaper to cancel the POA as he can sale the flat. Further along with injunction seek possession of flat illegally occupied by the husband.
Also file a complaint in the CAW cell for domestic violence and dowry harassment against the man and seek maintenance from him and protection rights and residence in your flat since he pushed you out,
Take urgent steps for cancel the POA as he can sell the said property with that POA.