In this case, it's different than the other people who are doing Service Request for their DACA application because there is no processing time for DACA, but there is a processing time after you send back the RFE, which is 60 days.
If the level 2 rep told you to wait until April 10, I would wait until then since it isn't a long time from now. If you don't hear anything by then, call again and try to put in a Service Request this time so that it goes straight to the Service Center.