Talking Watch not working?

Tavistock & Jones Radio Controlled Talking Watch, Model No EL3213.
I have had the above watch for 20 months. It was working perfectly until the watch started running slow, an indication the battery needed replacing. I took the watch to a professional repairer. The watch has not worked properly since the battery was replaced. It works OK as a watch, but the talking aspect no longer works, it does not sync. The talking part gives the wrong time, the wrong date, it says the year is 2008. The watch repairer has tried to fix this for 3 weeks and had no success. I've tried too. Still wrong. How do I fix this?