Unilever - Sunlight soap

I have been using the so-called 250g bar of Sunlight soap to make washing powder. I make it in the Vorwerk Thermomix which weighs accurately in 5 g increments. I noticed that 2- or 3 consecutive bars weighed in at less than 250g. I contacted the company and their explanation was that scales can differ by 5 g or so. However, the last bar I used about week ago weighed 210g! As they make many products, eg washing powder, and others that no doubt need weighing; either of the individual ingredients or the finished product, the public is being short-changed by quite a bit. For a company that has been around a while and has an extensive array of products - all I can say is 'shame on you'