It is your error - why do you feel you could do a credit charge call back?

You need to call Jet2 (Indian call centre of not), explain the problem and ask them politely if they would consider cancelling the tickets or giving you perhaps a credit for future travel. I don't believe that they are under any obligation to do so however.

jet2 under under no circumstances give refunds believe me i've tried, All they'll let you do is move them flights to another date and it has to be same destination and any difference needs to be paid. and with regards to chargeback you have no grounds to chargeback because jet2 have done nothing wrong although i suppose its worth a try but i doubt you'll get anywhere maybe its best to just loose the deposit with airflights

I've probably not helped much but i tried

Thanks
Andy