sovereign strimmer ST05 won't keep charge?

I am in exactly the same position as above. Tried all the same avenues ending up with the same answers, nothing!!!
Tried speaking to HB/Soveriegn on phone couldn't speak to anybody that way either. All lines/operators are busy, busy. Does that tell us something about the product we are talking about?
No wonder it's the discontinued line. And while we're on the subject the blades are rubbish too

VBS
June 2011