My ignition key would occasionally turn freely without catching

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What it needs to turn over,we just kept turning it clockwise carefully until I feels like it's catching again,this didn't happen often but happened enough times over 2yrs,other day when I turned it off- well I thought I was- the key turn freely the opposite direction & when I pulled key out which was easy - before I new it I realised my car was still running ,I put key back in but I still couldn't turn it off, am guessing when I pulled key out & ignition was turning think it turned around a bit extra & think it unsinked itself sumwere in the mecanaism, someone had to reverse hot wire it so we could turn car off with screw driver, we now start it with screw driver & it will only start when key is still in ignition, any advice on hoe to fix this eg: getting ignition back into sink, ps: the ignition had never turned the opposite way freely before, spoke to bow dealer & he said the ignition part I will need has to come from Germany, wondering if anyone else out there has had the same problem? & also if anyone has any suggestions? I want to fix it before the area were we put screw driver -wreaks the plastic slots that the screw driver fits into, cause if the craps out then I dont know how I would ever get it started, other than hat & 1 very minor problem my car is a good car, also wondering if the cost in fixing ignition problem would end up costing more than 1995 BMW 318i sell for,any help would be great,thankyou