4 phones on one IMEI number. What should I do?

I went to Metro PCS with my note 3 to switch it with my Metro phone. During the process they checked my IMEI number to see if its blacklisted and they told me that 4 other phones in 4 other US states were using the same IMEI as mine. My phone had been unlocked from Sprint and I checked to see if the IMEI was different from the original and it wasn't. What should I do about my situation.