Refusal to attend to concern/complaint

Unfortunately Gatti do not like to respond to concerns and complaints. Having bought 8 tubs of ice cream from one of their shops and 6 of those tubs being gritty and unpleasant, I attempted to contact the supplier on numerous occasions mentioning my concerns. Despite assurances that the manager would contact me, it has been two weeks and he has completely blown me off. No response to phone calls and zero response to emails.