Rs It Services — qc fail-asking for money to pay

I submitted the work in time and they said to wait for two days after two days they called and saying that your qc report is failed and asking for to pay money 3700/-.
In a given forms they used double spaces in the given forms as per the forms we typed forms and submit the work in that given forms they used a double spaces as per the given forms we typed the forms using double spaces in forms after checking forms they said that qc report has been failed and asking me to pay money.