No body??

Hi All, I have for many years lay in the background of this very informative forum when ever I needed any info. And now as others I have recevied two (yep two) fines for failure to notify disposal of vehicle - for two different cars sold three days apart and the V5's (part where you sell to a motor trader) sent off using the same post box on the same day (a Sunday) as the V5's had to be given to the motor trader. I have called DVLA and informed them that I followed the correct procedures as stated on the V5 and posted the documents by 1st class post and the dates they were posted. DVLA spokesperson has stated that they have not recivieved them and the fine stands (I am over due on the one by two days as I have been abroad for three weeks). I asked them for a breakdown of the losses they have incurred from these "alleged" offences and have been advised "Nil". I have now been reading through as many posts as possible on here but can not find a letter template to reply with or something to state my grounds. But on the 5th May I sold a car to a private individual and sent the V5 to DVLA and they reciveived it and confirmed it in writing. The above cars were just me being greedy and I wanted them all till the wife said NO!! I thank you all in advance for your help