Let car transfer percentages…Question about it!

I, now 25 years (12.03.84) old, driving license since 10.09.2002, i.e. 5 years. The insurance of my old car was registered to my mother and I was registered as a passenger (from the beginning). You/We started with SF1/2 and are now with SF3 (3 damage-free years). Now I sold my old car and bought a new one, registered to me and the new insurance registered to me with SF3. Today I got a letter from the insurance company, d Is it possible to transfer a discount on the basis of the driver’s license data and the usage period only to SF2. WIESO? It says that it can only be transferred so much, how much I could have experienced myself. Since I have already had my driver’s license for 5 years, I could have experienced the 3 years myself, so I have to get my SF3 or not? Or could I not theoretically have experienced the 3 years myself, since I should have started with SF0? the insurance company telephoned and they thought I should put all the documents together (of the old KVs) and send the license and all that again for verification. What do you say?