English term (edited): CSR = Customer Service Rep

Customers are encouraged to first discuss their concerns with the customer service representative responsible for the product before making a formal complaint.
fcac-acfc.gc.ca

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Avant de déposer une plainte officielle, vous êtes invité à discuter de toute question avec un représentant du Service à la clientèle chargé du produit.

Of the many examples proposed by Linguee, I selected just this one, as it comes from a bilingual CA site.

All the examples I found seemed to be translations (direct calques!) on the EN term, I have not so far come across an equivalent native FR term. Note that several variations are found, including the rather more succinct 'représentant du Service clientèle'

On the other hand, I have not found any evidence for an equivalent abbreviation used in FR.