You want it fixed? Correctly? Ecu/pcm/loom/tune/serviced plus whatever else ???then put it on a truck and drop it at CMS cresent motor sport in Prestons.
Will it cost a fair bit? Probably, unfortunately for u.
Or u car keep going the cheapest route possible and do it 5 times to be deeper out of pocket.
that's the options u have.
Question, this is very left field but a possibility.
Did u happen to connect your phone via Bluetooth to the car and do something u shouldnt of? Maybe? Like accidentally pull the file out of the ecu/pcm and lock u out of it?
Long shot but its happened before.