Updatation issue of whatsapp on iPhone 6 plus.

 I’m still facing same problem and unable to update my whatsapp messenger. This is problem which is I’m facing:-

“WhatsApp messenger cannot be updated because it was refunded or purchased with a different apple id”

Although I’m using on this apple id for last 4,5 years and i never faced this problem.

Kindly resolve my issue so that i can be able to update my whatsapp as it’s going to be expired tonight.