It seems your mechanic wasn't aware that control units can be repaired, with the greatest of respect to your mechanic ECU repair/overhaul workshops have been going for many years now, so i'd be wanting a second opinion on the fault before doing anything.
I suggest you spend several hours online searching Vx owners and any other forums for similar problems, someone somewhere will have been through this, and hopefully their experience will point you to a solution or points of call.
Its unfortunate for you, but these gearboxes and other electronic fitments (such as electric parking brakes) are the work of satan and should be avoided at all costs if you intend owning well out of makers (usually short) warranty.
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