Medipost Pharmacy - regular service failure

Medipost has degraded to the point that I now have to phone them on the day of my medicines delivery to ensure that my chronic medications are delievered on time. They usually say I need to pay in advance, however they do no sent me any invoice until I phone them. Numerous complaints regarding their sevice comes to nought. Even via their customer care line. Medipost , to me, is a failure in health care I wish we had more competition to chose from