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Write to our Customer Service team via private message on Facebook , Instagram or X from Monday to Friday from 09:00 to 18:00h, as well as by phone 91 080 62 29 from Monday to Friday from 09:00 to 14:00 and from 16:00 to 19:00. If you already have a customer account with GLS, you can access the assigned customer service contact by entering your username and password in the YourGLS section at the top.