Heritage acrylic paint

I have been using heritage craft paints for years without any problems. Since last year I have encountered many problems with their acrylic paints. The paint seperates and becomes very tacky, it moulds and has a terrible smell to it. This happened with quite a few of my 250ml bottles. I contacted the Company and was transferred to the Factory Manager who said he will get the GM to contact me. I have phoned about three times and was told by the Factory Manager that he did pass the message on to the GM. Up to this day I have had no call from them to sort this problem out. I had to throw a few bottles away which was not even a month old. Don't buy this paint and have the same problem as I have had. I have suggested to all my students to rather purchase Dala acrylic paint which is a nice paint and cheaper too. I am totally disgusted with Heritage!