unacceptable delivery time change

hi, i used buy many items from takealot, i understand how takealot operate their parcels, so i bear with them on the delivery time. but this time is unacceptable. i ordered and paid for one order of varies items on takealot on 4th of March. before i process my payment, it was clearly marked order will be delivered within 5-6 working days, but after i've done the payment, system immediately changed the delivery date to 17th of March, which it is 10 working days, that is not acceptable, and i alos need the item urgently. i could go buy it in builders next to my house. and i could not find takealot contact number, i have to email them for aftersale service,but their response is also unpleasant, they said due to stock unavailable, they must wait for supplier, but how come you are selling it but not available at the same time?and takealot always advertise next day delivery service... that's not acceptable. i supposed to rate only one star, but i gave 2 stars for their good service before.