Hi Doddi,
RTOs not only have different formats for this letter as some friends have mentioned, but they also call it different names, at least that's my observation. At some RTOs they call it "Driving Experience Letter", at some others they call it "Driver's Abstract", etc etc. So depending on what you called it and what your RTO understood it as, can also make a difference.
I can send a scanned copy of one such letter to your email id. Please note though, that every RTO has different formats and yours might not be exactly the same as the one I send. One more forum friend has faced the exact same issue as yours but he is no longer active here. I will ask him how he managed to get it ultimately and let you know. But for that, as Mitali has asked, it will be helpful if you can say which RTO you belong to. Also give me your email id.
Oh and lastly, one clarification. If you have this letter, you can take the G test directly i.e. you can skip G2 if you want. Or another flexibility it can offer (if you do not want to go for G directly) is that you can take the G2 without any wait period after your G1.
Best,
BhaktiUjjwal