Cannot stick to delivery times and makes excuses to cover the bad service

My Girlfriend ordered a phone for me from Digital Planet. They processed the order and she received an SMS stating that her delivery was to arrive on Friday 2 Feb 2018 between 8-5pm. She phoned them and let them know that they should deliver before 4pm as that is the time that she leaves work to which they "Made a Note". around 3:30pm she phoned them again and the woman on the phone said that they would still arrive before 4pm. Around 4pm she phoned again and they said that there was no such note stating that the delivery was to be made before 4pm. She told them to go listen to the voice recordings which they did but even after that she met resistance from management stating that they were doing her all kinds of favors and that she was in the wrong and they would try again on Monday. On our way home around 4:40pm the courier finally calls my lady and asks her where in Sandton he should deliver which she answered that she was already on her way home and he missed delivery. He then proceeded to take down out home address half halfheartedly and said he would deliver Saturday which never happened. She called them today which is Monday the 5th and asked them yet again to make delivery before 4pm. She then got an SMS confirming that low and behold they would make delivery AFTER 4pm. She called them and was furious but they insisted that delivery would be before 4pm. She left work today @ 4pm and she has no package in hand. Digital planet I have bought many items from you in the past. You can kindly write off any further business with myself and my lady. I bank with FNB and they too will know about this.