Bank is harrassing

Hi Team,

I need some assistance trying first time here

I took a home loan from nbfc company it's been 1 year now. Now I am doing a balance transfer to a govt Bank which is providing lower interest rate on my home loan but the nbfc bank. (Mahindra) Not providing the foreclosure and other required documents stating that we have policy and will give you after 25 days this will lead to pay me an extra emi interest of worth 50k. Earlier they are behaving in good time but since I told them that I will get balance transfer their behaviour is changed and they are not responding correctly and even today disconnected my call stating it's company policy we will give u after 25 days once it will be processed. Even they took 1 month additional interest earlier and when I pointed them they states that it will not be changed.

Can anyone help suggest?