Allow slashes in customer phone numbers (from Amazon)

[MovieRapid]

Hello,

We use Lengow module to import orders from Amazon. Since a few days ago, Amazon Germany allows their customers to use slashes ('/') in phone number, and when they do it, the import does not work: it says phone number not valid. How can I fix it?

Thanks

[MovieRapid]

Hello,

I forgot to say that we are using Prestashop 1.6.1.7

Thanks for your help.