Problem while importing calls

Problem while importing calls

I used Zoho on one domain and wanted to move it to my other domain. So i exported everything to CSV-files and tried to import them again.Wich worked, except for one problem.

When importing calls and Activities the link between client/contact and the activity disappered.

This is a big issue for me since i am now not able to follow up what have been told to each client last time we spoke.