Out of warranty stud repair - Mulberry

[sugarmonster64]

I have a nearly 6 year old Mulberry purse and the three main press studs are no longer secure and frequently open up meaning I have change all over my bag. It's been like this for a while so not a new problem but I'm sick of it living in a box when I want to be using it.

Has anyone had something similar repaired by Mulberry and if so roughly how much did it cost?

Thanks