MedXpress Delivery Service Dives

I have noticed that the MedXpress delivery service from Discovery has changed service providers, previously this service ran smoothly and effectively, over the last couple of months it has become nothing less than a joke. I use this service for my chronic medication only so I generally give 5-7 working days notice for the next lot to be delivered, prior to the change I think the longest it ever took to be delivered was three days, now it is always longer than three days. For some reason I get phone calls from the delivery service confirming the delivery address and the details are always incorrect, very strange considering I am the person typing in the delivery address and it has not changed in a number of years. This time around I was called last week Thursday and the address was incorrect, I corrected it and was advised that my medicine would be delivered that day or on Friday, come Monday and still no delivery. Rather do not offer a service if this is the best level of service you aspire to.