1. If the cheque is cashed you can track it on line after noon on the same day.2. The cashed cheque usually is sent to you with your monthly bank statement. Keep them for up to 7 years.3. The cashed cheque(s) is (are) NOT the proof for your rental payments for Canada Revenue Agency. Only the receipt from your Landlord is. you can easily be audited if you do not have the receipt.4. The charge to cancel or stop the payment on a cheque is usually $35 depending on the bank. Pls try to do it in writing (via e-mail) and or fax to have the written proof in case of any error.5. Pls try to have all the conversation with your landlord via e-mail as it will be written proof and for about 2 years now can be considered as a legal proof.