Zomato accounting

If we are running a restaurant bussiness and we are also delivering food via zomato & swiggy then zomato and swiggy cut their commission with axes and send us money on weekly basis after deducting tds and tcs as per the excel sheet they provide us. For their commission they gave us a service fee invoice.
So the question is 
Why they cut tds and tcs ?
Bcz we are not giving them in any service and invoice