You don't need to save, open skype for his id and you will see the call durations, just get the screenshot and attach the printout. Yes that is also a great proof of pics with his family and siblings. CNIC and Contact numbers are just to clear your position that there is no doubt and they can be contacted if CIC needs so. It will just clear the CIC doubts, but if it is difficult to provide then add just their contact numbers. That will serve the purpose.
You may ask your husband to collect the letter of his phone company that states about calling or receiving calls from your number on his number. Also ask him to ask his network provide o give him call history for past 3 months.
What are you missing??? Think as your VO, you will get the clue; and then prepare your case.