Disgusting Service. Also, where are my damn flowers?!

Last week, I ordered a bunch of flowers to be delivered to my mom for Mother's Day. Firstly, Netflorist kindly changed my delivery date to Monday the 11th without consulting me, and the list does not end there. On Monday, the bouquet still hadn't arrived. I emailed Netflorist and I am still waiting for a reply. On Tuesday, I got an email saying the parcel had been delivered and signed for by "delivered" yet the parcel still hadn't arrived. My parents checked with their neighbours and no one had received anything. My. mom managed to get hold of Netflorist who put her in contact with the delivery people. They promised her they would deliver a fresh bouquet the same day (ie yesterday). Well, again, no flowers arrived. When we called them today, they said they would try to find out where the bouquet is and they would call my mom back at 3:30. It is now 19:23 and she is yet to receive a call. I paid a lot of money for those flowers. This is the first mothers day that I haven't been with my mom. I am absolutely disgusted in Netflorist and their utter lack of concern regarding this matter.