2nd rate products and service 1st class let down

I bought a Huwawei LTE router as an effective way to connect my home to the Internet. However my joy was short lived as my router failed within months due to a manufacturers fault. I took the device in and had to wait 2 weeks before the repairs department came back to me to inform me that I could collect a new one (after arguing and quoting sections of the CPA). Fast forward to today and I am sitting here with the same problem not only has the replacement device (brand new might I add) failed in just over 3 months but yet again I am asked to wait 3 weeks before they get back to me. Bearing in mind November is exam time and I have to resort to my cellphone to aid me in my preparation, any data I purchased will be expired within the time it takes for them to come back to me. To further demonstrate the nonchalant nature of the repairs department it almost took an entire week to send it to the supplier (I received confirmation today that it's been recieved by supplier after dropping it last Wednesday). This after telling them the urgency of my situation. I sincerely hope others learn from my pain and think carefully before shopping for electronics at Makro