We are sorry to hear that. TOmcat Blocks are in fact identical to the trade product "Contrac" blocks. THe only explanation could be that the rats have more palatable food available somewhere. If they had stored the blocks, it is probably that they would have eaten them sometime soon but clearly you cannot wait for that. It is important that you realise, the poison takes 5-7 days before killing. Maqybe your contractor will use cut wheat bait which is less easy to carry off. Nailing blocks down or putting in rat bait boxes on metal rods can deny the rats the ability to take them away so that you do not know if they have eaten them or not.
Kind regards,
Bob
