Magento Customer Database Error - repost

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Project Budget (USD)
$30 - $250

Project Description:
I have move from another platform to Magento. I import the old customers data with CSV into magento.

There is some error after import. The date in 'customer since' column is wrong. It shows -1 for the year. Besides that, some is showing the future date, eg. 1 of Dec 2013.

When the customer log in form frontend, sometimes they see different name. They see other customers name from different customer group. The price they see also will change.

I would like to solve this issue.

Skills required:
eCommerce, HTML, Shopping Carts, Website Design
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