double deduction of tds

Michelle (Service) (297 Points)

20 February 2017  
A makes payment to B (10000- TDS @ 10℅)=9000.
B then makes the payment to C (9000-10℅)=8100.
B was unaware that A had deducted TDS too.
Now C is at a loss due to double deduction.
What can be the best solution?