mistake on landing paper

[smartcq]

I landed in Toranto 20th June with my wife and my son. We found out that the "Became PR on" was mentioned 30th June on the landing papers of my wife and my son, while mine is correct. How can we have it corrected?

 

[steaky]

Contact CIC immediately using the 1-888 number

 

[toby]

Is this error important enough to bother correcting?

WHat could go wrong if you left it as is?