Oil Temp Gauge/Heater

[Jon McG]

Hi all,

can any of you Audi owners/mechanics help with this issue?? 
my oil temp gage when driving will not move from 50° even when the engine is hot (see pic) this is also stopping any warm air come through the heaters!!

after driving when stationary the gage will go up but the heat slightly warm at best…..

I’ve had an oil service just done and the coolant is fresh and topped up….

any advice would be amazing!!