Can I use my $140 Koodo dollars towards an iPhone 7 and keep my $47 plan on tab medium?

I have an old plan where I was (or am not sure because I’m not the account payer) getting Koodo dollars on a $47 500 minutes and 1gb plan and need a new phone and want to get a iPhone 7 on the tab medium and was wondering if I can put the Koodo dollars I have towards the iPhone 7 and still keep my $47 a month plan on the tab medium. I understand I will not be able to keep collecting Koodo dollars if I still am, it’s just the guy at the kiosk said I would most likely not be able to keep the plan and use the Koodo dollars, so I would have to choose to either change my plan and use the Koodo dollars or throw away my Koodo dollars and keep my plan.