NEW MECER LAPTOP FAULTY AND MTN REFUSES TO FIX/REPLACE

I am utterly disgusted in the assistance, or lack thereof. a Telephonic sales rep presented a deal for a Mecer Laptop, which I actually do need for business, and we proceeded to do the neccesary. The device was delivered successfully. I left the device in the box until I returned to work, so that an IT rep from our business could do the set-up accordingly. The box was opened within 2wks of receiving. Not being notified or explained that I only had 7 days to open the box. Upon IT expecting the settings, they informed me that the device was faulty with not being able to connect to any available wifi. They advised the machine had a software issue. a Device out of the box the very same day. I proceeded to try and log a call for 3 days via 083 135 (claims to be a help service) only to physically go to a local branch, which also directed me to a bigger branch further away. Once at the bigger branch, they directed me home and to call the help line and first log a ticket and then return with the device to replace. On day 6, from opening the box, Finally the help line puts me through to a consultant, whom put me through to another department, this proceeded up to about 4 to 5 different departments. Only to come to a conclusion that the brand new laptop received has been in my possession for longer than 7 days and I would need to take it in for repairs and pay for any faults myself. This is shocking and I am in total disgust that I now need to pay this device for the next 36 months AND it was delivered as a faulty device, to which I have no idea what repairs are going to cost me now. I have been a loyal customer for over 20 years.