I took my 2006 Ford Focus into a local garage to change two tyres. However, when I collected the car I found that the gear stick had shifted to the right. As a result, reverse was where 1st was, 1st and 2nd had moved to where 3rd and 4th was, while 3rd and 4th were where 5th and 6th was. I obviously can't get into 5th and 6th as the gear stick won't go any further.

The garage is claiming it's a coincidence, but I have never had any trouble before and the problem started when I collected my car. Do you know what the problem could be and how it could have occurred?