Poor service

So I ordered food from McDonald’s and firstly the food I was delivered was incorrect as i ordered 2 grand chicken burgers with mc chicken sauce and no garnish, however when it arrived it had garnish on and hot sauce instead of mc chicken sauce, on top of this I ordered 10 chicken nuggets which never came with the order, I then tried contacting the montague gardens branch and there number wasn’t working, I then contacted the delivery service to get a branch number and they were unable to assist as they had no alternative number, I have no idea what to do know as I have paid for something which I haven’t received