Same problem with me...emailed them via the delta.com form and it was fixed today.

Their e-mailed response (even though I didn't say I was disatisfied...just stated the error)

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Thank you for contacting us.

As requested, we have deleted SkyMiles account ........ and
transferred all applicable mileage to SkyMiles account ........
Please use account number ....... for all future mileage accrual and
redemption requests.

Please accept our apology for the unfavorable impression you received
in
this instance. We appreciate your selection of Delta and will always
consider it a privilege to be of service.