Poor download speed under 1mbs evening & 15mbs daytime

Poor download speed. I have a fixed wireless option from afrihost and I haven’t had any hassle until last week. I regularly got 30-50mbs download when I started with afrihost and now I can’t even get 10% of that in the evenings. Every night since Saturday I have done a speed test and it is less than 1mbs or just over that. Sunday and today(during the day) I did a speed test and I was getting min 15mbs. I can’t watch Netflix or DStv now due to extremely poor download speed. Thankfully I’m not on a contract and if this continues, I will be take my business to another company.