i have not yet received my goods and receiving automated calls saying that i must rebook my delivery and with extra charge

i have not yet received my goods and receiving automated calls saying that i must rebook my delivery and with extra charge. snatcher send a email earlier that my goods are ready to delivery and i should nt required to pay extra. it seems like its double charge of same goods. its kinda of nasty way of doing business as per my understanding. Their phone numbers were there and snatcher and courier service buffeloex websites. but buffelo numbers not been unanswered. Snatcher number went to automated call that they are no more entertaining phone numbers at any more.