I have got 4 square 5730 ml containers. Now after ...

I have got 4 square 5730 ml containers. Now after few years, the lids are totally broken and the whole containers can not be used. Company give lifetime warranty with replacement.Containers are tough but lids are of very poor quality.If lids are made available freely, the containers can be used for another few years. Please let us know from where the lids can be replaced or purchased?