Radio wiring

Picked up an 05 A4 Cabrio couple of weeks ago.

It already had an aftermarket radio in it . But it wasn't working right. The front speakers weren't working properly.

I wanted to put a Bluetooth unit in anyway so wasn't too concerned, till I pulled out the radio. it was a ball of ****e in behind. 2 of the 3 original plugs were cut off and some of the wires were routed through some foam covered pcb of sorts. I picked up a couple of sets of original wiring (plugs with a few inches of cable) off breakers on eBay but a few wires seem different. The car had the single din concert stereo from factory according to myaudi.

I had a go at it but not having much luck so I'm thinking of leaving it to someone with more knowledge .

So that brings me to the end of my story. Im looking for recommendations in the Dublin area or surroundings. Do ICE in Ranelagh do this sort of thing?