Rayco water tanks - inferior quality

We bought Rayco Tanks 10 x 5000 liter tanks from them for our business.

The delivery etc was great had no complain about it.

But the tanks is made of inferior quality of is made to thin (specially at the joints.

They constantly leak - and the tanks was repaired by them. But it even start leaking at the repair places.

The 10 year guarantee they give is worth nothing. Because then the tanks is not installed right, or the ground level is not 100% right, or this or that. But there is always an excuse why it is not guarantee.

The tanks is just plain not up to standard, they cutting on material thickness to make or saving on manufacturing cost.

But I will not tell anybody to buy these tanks. Nor will I every promote them. I will rather go for one of the other well known brands.

Still wonder why do the big companies like Agri and Builders etc. not sell there tanks?