Can i change a booked cabin to a guarantee cabin?

[Aussie Jeep]

Can i change a booked cabin to a guarantee cabin?  I booked direct with MSC

[Até]

It might be possible if you're before final payment, unfortunately MSC varies wildly in how possible they make it - and how badly the booking can get messed up.  Sometimes it's just easier to cancel and rebook. 

[perakcruiser]

8 hours ago, Aussie Jeep said:

Can i change a booked cabin to a guarantee cabin?  I booked direct with MSC

Depends if you booked with MSC Brazil, Australia or elsewhere. Rules are different for basically every market. I have no idea about their Brazil or Australia rules.