And your response to direct message makes it look like you are going to respond but it just takes you back to the standard responses you get through facebook too...
@sainsburys absolutely disgusted - just waited ages to speak to customer services to find out where my order is only to be told you've cancelled it! Just didn't tell me! Your response is I can have a £10 voucher and then try and reorder????? Oh, and its not possible to complain?