Dishonest Website Special - Prices raised on order VERY DISHONEST PRACTICE

After calling their Offices to confirm their pricing relating to product sizes on their website, I was told to e-mail my order and sizes which I did, the quote came back more than advertised on the website By R5000 on my order alone, They simply say they are sorry that is how it is, their website needs to be updated - How is that my problem I even called and confirmed telephonically. I had quoted my client based on their initial Price for Freezer Jackets on their Weekly Specials page @ R230 Ex Vat, now they are R255 Ex Vat and prices climb by size which I confirmed was not to be the case and also is not stipulated on their Page, now they want payment upfront I am untrusting considering my order is now R24000 Was R18000 how do I trust them to fulfill their obligations if they can't even be honest from the beginning