Letter format for calling back left employees:
It has been a while since you left XYZ. Hope you are doing well in your chosen career.
XYZ has been growing at a rapid pace with the addition of several new clients and increased volumes in work. In order to meet these new challenges we are aggressively hiring experienced DESIGNATION
I would like to thank you for contribution during your stay with us in the past and wish to extend to you a warm welcome back to XYZ should you decide to further your career with us again.
Please feel free to call me on 121212 or any of my colleagues BB at 222222 / CC at 333333 to know more about the latest news at XYZ like the new Compensation, the new Career Growth opportunities,
the new technology etc.
I look forward to hearing from you soon to work together in the XYZ Team.