Messed up imei number

I bought a Samsung galaxy j7 at CNA store in January and my phone was ****** in September,I went tompen a case for insurance purposes I then called vodacom to blacklist the phone Then the imei number was missed with one number from the one in the box now I don't know whether the problems is with vodacom having the imei number or at the store where I bought the phone . now at the insurance they can't process my application cause they said I have notyet blacklisted the phone,after that I went to CNA to help me sort this imei thing and they told me they cannot assist me and I bought the phone from them