Unanswered promises on falty sealent product

We bought four 20 litre pavers to seal our stones. The work was done by a person appointed by Lekker Rubber. Unfortunately, the product, according to one of the owners, was faulty and it did not dry, but remained sticky. This caused dust to end up on the paving and stones and spoil everything. My negotiations with a person called Dean are full of promises, but no action accompanied by the promises. Two of the four drums were dropped off at our residence. I don't know if he hopes we will just stop asking to fix things. The financial loss for us is quite large, as we are pensioners Trust that HelloPeter can help with the situation.