Lawn care in

We contracted this firm, Dave was our project manager, he told us they bwould look after our lawns, First was airating, no effect, they said slit seeding, no effect, then over seeding no difference, then weed and feed, nope. we ended up with an infestation of purple beagle which Dave assued us would be looked after with a re sod, was done a couple of thousands later, come and look at our dead lawn and dave has the nerve to write to us with an offer to look afetr our lawn, please come and see their work