Montego dogfpod

Good day. For the last 2 days o have asked Montego for help. No reply. I bought a bag of Montego classic adult 2 weeks ago and it cost me R409.99. Half way down the bag the food is mouldy. I do not have the receipt anymore, and being a pensioner, it is a lot of money for me from my pension. To not even get a reply to me is very bad business ethics. I cannot afford another bag, so my furchildren are eating bad food, and I feel terrible. Is there anyone who can help me get through to Montego customer care. Thanking you in advance