@ Aamir
If you got an RTR license on the basis of your Canadian CPL and Canadian RT then you don't have an RTR A ( a pink booklet ) , what you have is an RTR P ( a sheet of paper )
An RTR A is obtained on the basis of passing both part 1 and part 2 of the RTR A exam
As far as my knowledge goes your Canadian RT is valid for life .
You have 3 options going forward
1. Renew the Canadian CPL and get a new validity and then apply for a FRESH RTR P ( not renewal ) allover again
2. Pass Part 1 and obtain an RTR C on the basis of your Canadian RT . Since you Canadian RT is valid for life you will get an Indian RTR - C for 20 years
3. Pass both Part 1 and Part 2 and apply for an RTR A with lifetime validity
You cant apply for jobs anywhere with an expired RT so the earlier you renew the better .
The 1st method is the fastest .
The second method is slightly slower but you get a longer validity .
The 3rd method is the best as you get one for lifetime and never have to worry about it again, but it can take time
There is a 4th option wherein if you have 30 hours of flying experience within the last 5 years you can apply for an RTR P renewal in instead of giving part 1