HUAWEI model: B612-233

How I wish MTN can change my home router HUAWEI model: B612-233. Since I took this home WiFi internet package (over a year)I have been experiencing nothing but poor connection, I have sim contract and now even if I’m at home I am forced to change to mobile data because this WiFi is having poor of the poorest connection I can’t imagine in this world. I’m fed up.