Hello unclesamy,
If you are indeed entitled to a refund, then you should receive it in one payment (pending certain conditions, discussed in the link below).
For more information, please review this page here: http://www.revenuquebec.ca/en/citoyen/impots/dec_courante/remboursement/default.aspx
Madan Chartered Accountant team,
www.madanca.com