I have accounts with many brokers. I have MOSL too. In my opinion MOSL is one of best broker in industry. The quality of research is the best. Payin and payout of funds is just fantastic. Trading platform is also good. Its easy to use. They track their tips till target. I hardly see any one who tracks live tips every day.
The only point is brokerage is high, (it has to be if they need to run biggest research & dealing room in country.) If you are trader you can take their tips and run on RKG or Zerodha. If you are investor, stay with Motilal, as their positional/ investment /fundamental calls are good.
If you want to contact them, call on call centre, they will take care for sure.
One thing, yes they are big, they will not assign delaer until you have more than 1 Lac in trading account.