You can dispute online...which I did or if you mail make sure its CMRRR and kep that GC
If writting all you need is
your name address SS #
Name of whoever (CCC) Capital 1
account # on your report
reason for dispute....now I did online & was offered multi choice....examp: 1 CRA had belongs to another person,relative etc.....another CRA only had not mine
I used not mine on all but 1 and that was because I knew that I was only an AU.
Copy everything that you need direct from your report. Whrn the account # has #### at the end put them in.Do not correct the account # that is given you by the CRA...they might scramble them. just copy what they have.