Rainbow frozen burger portions misadvertising

Im only posting here as i do not have an email to send my complaint too.

I have been buying your products for years without issue. The other day i opened your 6 portion crumbed chicken burger patties and only found 5.5 with one being clearly cut with a knife meaning someone had to hold it and physically do it to enable the portions to be less than advertised. This is unacceptable as it says 6 portions and I had to share my supper as a result.