I had similar issue the second day after in CA where the vo in the border gave me the wrong NOC occpuapation, I sent back to cic and get it corrected.
I believe it had to be fixed if you are under close wp, otherwise it would be an issue when you apply for PR.
Call cic and they will tell you exactly what to do, as it happened to me 2 years ago, in case there are some changes recently re the procedures.