Nedbank service pathatic

I have a business and I use Nedbank as my banker I have encountered to many problems with false promises. 1 they charge me a monthly fee and its paid on time I have a merchant Device with them and few weeks back I told them the device gives me issues and no network most of the time they sent a technician out and also was not in the specific time allocated .. few weeks later after replacing the machine the chip reader stop's working I call in the center again they promise me technician Will come in 24 hour's the technicians arrived 2days later then they specified time he comes and reallocate a new machine according to them he basically just leaves and this machine is worst then the previous machine it doesn't swipe nor insert and I am left in dark because I'm losing sales and they promise me today they will sort it out but nothing again. Pathatic service