A more specific statement by QR Twitter team, related to the procedure in case of change from Qsuite to non Qsuite
QUOTE
If the change to non-Qsuite is verified, you are entitled to 1) one-time free change (+/- 21 days of the original date; new origin or destination within the same country or 500-mile radius from the original origin or destination); and 2) refund without the cancellation fee.
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UNQUOTE