it didnt kill the fleas IT KILLED MY KITTEN

so my kitten were 8 weeks on tuesday and on saturday night he found some fleas on him which we used bob martin drops at first he was ok but then he seemed to scratch alot and he wasnt happy at all he couldnt rest the next morning he wasnt eating his dinner which is very strange for him as the day went on he couldnt keep still and was crying and wouldnt leave me alone begging me for attention to cuddle him a few hours lates he started to shake so we washed him stright away just incase as we thought a flea drop wouldnt harm him after we bathed him he got worse and couldnt keep a limb still he was shaking so much and was staring in my helps for a sign of help i rushed him to the vets which she quickly bathed him again and shaved him and then gave him 3 injections as the bob martin poisoned my kitten he went 2 sleep and woke up shaking evan more and went into a fit so she had to gas him so he would be at peace 2 attempts she woke him up from the gass and as soon as he came round he was stright into a fit, they were a 90% chance he would f made it but more than likely he would be brain damage and organ failer and an hour later he was put down, how my gorgeous loving baby healthy kitten was so poorly with in a day because of this evil product, i am so heartbroken and all i want is my kitten back, i am going to report this and im taking this further and to court until this evil killing product is taken off the shelfs i will not stop until there is something done