On April 9, 2020, the Canada Government sent out a one-time special GST payment.
This payment will be approximately double the amount of your annual 2019-20 entitlement. In order to receive it you must have filed your 2018 tax return and normally receive GST.
For example, if you receive $500.00 annually (or $125.00 quarterly), you will receive the $1000.00.
Check you bank balances to see if you received it.