Lost contacts Iphone and Icloud

[davyk31]

Rather stupidly I was upgrading my wifes Iphone to IOS5.1 as she hasn't yet got cloud backup. I logged it is using my account details not realising this would cause a problem. Then on her phone all my contacts appeared as well as hers, I deleted all mine on her phone again not realising this deleted them from my phone. As I have been using Icloud for a while I don't have a recent PC backup. I have restored a backup from Icloud to my phone from about a week ago, this loads all my contacts and they can be seen briefly but they then disappear and are overwritten by my wifes contacts. Her phone is no longer on the same cloud account but seems her contacts have been written there and this causes mine to disappear and hers to stay on my phone.

Basically I need a way to stop it doing whatever sync it does to load in her contacts and just leave mine untouched rather than make them disappear.