Honest truth? You really messed up in the evidence you provided and that's why the application was refused. This wasn't an IRCC error. It's really strange that you provided a pay stub from June. If you're only going to provide one, why not a recent one (i.e. from September 2020)? You also should have provided a recent employment letter (i.e. dated just before you submitted your application). An employment letter from the previous year was never going to work or meet the requirements.That is correct, but I have all the paystubs, I thought providing all was not necessary,
Anyway, you can't go back in time. Submit a case specific inquiry and ask for reconsideration. IRCC may or may not reopen your application given the refusal was correct based on the evidence you submitted. Include your T4 for 2020, a recent pay stub (meaning dated within the last month), and a new letter from your employer dated now.
If IRCC reopens your application, then great.
If not, you'll need to create a new EE profile and wait for ITA again (basically start the process from scratch).