Free Apple Music - still waiting after two phone calls

[stillwaiting]

My tariff that I signed up to on the 3rd December included free a free Apple Music trial. I did not receive an activation code. I called o2 customer service on 17th December and they said it had been escalated and it would be received within 48 hours - I didn't receive anything. I called again on the 21st December and they said it had been escalated and it would be received within 48 hours - again I didn't receive anything.

What else can I try?

[Oxonian]

@stillwaiting 

The problem is that O2 are currently taking eight weeks to investigate and respond to complaints ; that will get worse if everyone takes your advice and goes straight for a complaint. 

There is clearly a time and place for using the complaints' route, but for some issues it can actually delay resolution. In my view, it is always best to try other channels first and to regard complaints as a fall-back position.