Missing phone numbers

Missing phone numbers

yesterday I have noticed that most contacts' phone numbers are missing. At first I thought it is a synchronisation problem with my Android phone but as I have found later, numbers are missing on Zoho. I have tried to reimport contacts from a backup but they appeared without phone numbers again.
I am not sure what's wrong but I have noticed that two numbers have survived, looking into my backup vcards I see that most contacts have duplicities in phone numbers having TEL;TYPE=others and TEL;TYPE=CELL usually. I can understand that Zoho doesn't like duplicities but I am not sure deleting both numbers is the best solution.

Is there any way to restore phone numbers deleted by Zoho? I have my backup but I am not sure if it contains all recent changes.
Is there any way to prevent Zoho from deleting phone numbers (and any other stored information) from contacts without warning?
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