Took loan on behalf of a friend not paid installments.notice from Co.

THE STORY BEGINS in 2010 WITH A, B & C. A & B were friends & C is a finance company.B wants to buy a second hand car through C but since he was a student it was impossible. 'A' was already doing a small job.A helped B to get finance from C for 70k. A risked his own 24 cheques to the C because B promised to manage all the 24 instalments.B paid 2 instalments and failed. C started presenting the cheques into A's bank continuously. A's account was closed in 2011. C keeps on sending the notices every year promissing to take action according to negotiable instrument act on A. What is risk for A now?