Hmm, almost sounds like the light controller has been programmed for daytime running lights, but seeing as you've only just replaced the switch, then logic suggests there is either a fault in the switch itself (electrically, or the new one is "wired" for DRL), or you have managed to plug wires incorrectly/shorted something out.
Do the headlight stalk functions (high or low beam, flash on low beam) work normally ? That might give you some clues.
2017 MY18 Golf R 7.5 Wolfsburg wagon (boring white) delivered 21 Sep 2017, 2008 Octavia vRS wagon 2.0 TFSI 6M (bright yellow), 2006 T5 Transporter van 2.5 TDI 6M (gone but not forgotten).
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