My brother lived in canada and moved to England and the royal bank tried to collect. There are jurisdiction issues as the original contract in regards to collections would apply to his province only, and since hes not a resident of any, their only option would be for a judgment that is only valid in the territory it's issued from and a hope he will return.
To sue him in England, he would only need to proove the debt did not occur there and he's fine.
The royal bank first sent him letters to him the UK as his statements went there because he had planned on coming back, and he then got one or two from the collection agency in the UK over the next year, but nothing ever happened. His was an $8,000 visa. This was though, 10 years ago.
He is moving back in a few months and got his equifax to apply for a mortgage. Nothing on there derogatory.
As for calling a lawyer, you only need to talk to one in your province as it's by your provinces laws that a debt can be collected, and it need to be by a collector licensed in your province.