Most horrible customer service ever

Such incompetence I'm shocked, i just have gotten zoom fibre installed signed up for a R599 deal that is discounted to R399, they have not added the discount, which i queried about from the point of activation, every agent has a different explanation on each contact, they have said that the discount is going to be added in 2 to 24hrs, its been 2days and nothing still, I asked can they ensure that my services is not cut while they sorting it out, they consult said it will be running until 1 feb when the debit order it due and todays the 28 jan and its disconnect , seems like sytem training is useless cause they don't what are doing and can not follow timescales given, when needing to speak to a manager, it seems that are all gone, utterly horrible customer service