Challenge/notify CERB repayment.
Basically I applied for CERB both through EI and CRA. I recieved $2000 from each. After a conversation with the CERB hotline I released I was supposed only apply for one so I sent the one from the CRA back two days after receiving it. Anyhow I noticed n my CRA my account a message saying I have to send back the $2000 which I had already done. I was wondering how I can notify or challenge the CRA request electronically?