You can either write them a letter stating you have no knowledge of the previous addresses or you can simply dispute online as "never lived there".
Here are the dispute pages for each CRA;
EQ Equifax Online Help: How to Correct Errors on Your Equifax Credit File TU TransUnion EX Experian | Credit Dispute
Disputing online may be OK for disputing personal information such as your addresses or phone numbers, but it's not recommended if you plan to dispute anything else.