1. I am not sure how these people would gra your house illegally.
2. Though you have done illegal things in getting yourself involved in betting but I believe there is no proof of payment to you.
3. if that is so then they can not lodge complaint against you , more so, the change of hand of money is itself illegal for which no complaint can be lodged.
4. Shun all connection with them and concentrate in your studies only.
5. if they are threatening you lodge complaint against you Do remember more you fear more would be ther pressure. So put a brave front at whatever price it may cost.