Network issues

I ordered a router online and it was delivered on the 25th of November the router and SIM card are supposed to give me 100mbps download and 2TB a month , when I connected the router the speedtest was 15MBps, then It was on and off , I called customer care multiple times and no was able to assist me , some lady said I needed to go to a Vodacom shop to get my sim activated and when I got there they told me the router sim was already activated, I was told to insert the SIM on my phone to see if it has network, the SIM works on one phone and it doesn't work on my other phone , when I put it back on the router it does the on and off thing, so I called 135 to get help, they investigated and took the router model number, then they told me the router is not compatible with the SIM, all of these things were ordered online, now I'm supposed to call the after sales department but unfortunately they are closed , so I just want to cancel this order as it seems Vodacom is a hustle when it comes to providing assistance, i also cancelled my satellite internet because it suddenly stopped working and they told me a tree was blocking the signal, I just think Vodacom is weak in my area , so before we go far I just want to cancel the order and seek assistance elsewhere