Authorised person cancelation from broker

i became a sub broker (Authorised person or AP ) of a broker company. They collected 50000 (deposit) + (AP registration charges at National Stock Exchange) on 09/05/2024. For this they didn't issued any receipt,appointment letter or agreement copy .I also opened my personal demat a/c at same broker and told them to apply minimum brokerage charges. But they overcharged ( brokerage) my demat account for three months .i repeatedly requested them to apply minimum brokerage in this days, but they did not. They also didn't registered my my name as AP at NSE. I stopped trading and asked them to return excessive brokerage after computing rs. 20.00 per transaction.Broker refused .On 19/08/2024 I stopped working as AP and requested them for closure of my authorised person contract and informed them that i am withdrawing my consent to register my name as AP at NSE to save my 12000 rs. But they registered my at NSE even clearly knowing my disagreement or dissent for the same.NSE takes only a weak to register or reject AP registration proposal, but broker claiming that it was in process since June 2024. This broker never sent any closure document to me but claiming that they sent Closure document when i repeatedly requested them for AP closure. This moth i sent a Notice for closure of my AP with the broker, asked them return all my money amounting rs 62000 with interest,exessive brokerage and compensation for their wrong doings. please suggest me suitable action against this broker. Now i am not in position bear the lawyers fees at this time.Can i fight this case in the court representing my self? Thanking you for free but valuable advice and support in advance.