Jabba connect -Proper Ref number

I once bought a cell phone from them, but the following day I lost it. After sometimes I found out that they handed me over to Nimble Collect. I settled all the balance with them. Moreover, the Nimble group has provided me with the settlement letter. The very same letter doesn't help me my name still appears on the bureau simply because Jabba Connect is using a different reference number. I tried to google the Jabba Connect without success. I am still appearing as a bad payer and I can't move on with my life because of them. Please assist me in resolving this matter.