Hello, I recently raised an RMA replacement request and it was approved and I got the email with the UPS label and the information but do I have to pay anything like delivery charges etc, to send my product back to sandisk for them to send me a replacement?
No. Just print out the label and attach it to the envelope/package. Then just drop it off at your nearest UPS office. 
For reference, here you go for a detailed one. 
http://kb.sandisk.com/app/answers/detail/a_id/5232/~/return-material-authorization-(rma)-process
