I flew AI 130 LHR-BOM on Jan 26.

The 788 pushed back 2 h late due to inbound delays. Fair enough...its LHR.

The map on the IFE did not work. The inflight service (in Y) was rudimentary at best.

I was traveling on a full Y tix. so I contacted AI for a paid upgrade. Their 1st response was contact AC. I did. AC said contact AI, so I did. AI said I could only upgrade on the day of the flight at LHR. So I tried. I was refused!

I have never heard of an airline refusing $$ for a paid upgrade? So I contacted AI customer service and asked for an explanation? To date I have only received a pro forma computer generated reply!

INO, AI has the worst customer service in the Star Alliance.