Benefits coverage

I started with a new employer 7/5/11. Offer letter stated benefits began effective the beginning of the month of employment so it was effective 7/1/11 .. OR .. I would be automatically enrolled at the lowest coverage effective 7/1/11. Last day of employment for previous employer was 7/1/11, appropriate 2 weeks notice given. Per Benefits Specialist request from previous employer, I was to forward the letter of acceptance since my situation was deemed a qualifying event, which I did, immediately, requesiotng a benefit termnation date of 6/30/11 so I would, in fact, not be have duplicate coverage. Last two checks dated 7/1/11 & 7/15/11 from previous employer included deductions for July even though I was told they would not. I was reassured a reimbursement was put in place for the 7/1/11 check and benefits had been termd effective 6/30/11, according the the Benefits Specialist. When I received the second check for July, there were no reimbursements AND the second premium deductions for the month of July were taken. Just received a call from the Manager of HR stating I was covered for the month of July even though a request to terminate was sent for an effective date of 6/30/11. Is this possible? I now have paid for medical benefits for two employers for the month of July. Am I entitled to get a refund from the previous employer since I submitted a life status change for a qualifyting event in a timely manner? Additionally, no one reached out to me to let me know what to expect even though I was in close communiation and there were several methods of contact for me available. Please advise.

Thank you!