Cst in case of sales returns

you need not to issue the c form if the goods are returned in the same quarter...

had u done this within the same quarter or not ????

Purchase Return in full, u need not issue the Form-C, since already debit note is raised against the transaction.  The supplier will submit this as proof for Sale Return at the time of Assessment and any ITC is claimed, it must be reversed in case of TN (ITC reversal is Subjected State Law).

it is a sales return. Hence ebit note not required. It is returned agains invoice . Hence in books of account account tallies.