Cell C is horrible

This is ridiculous, how can i get 6-8 Mbps for 2 months which if i might add is bad as it is but i could still work and now for the past 5 days I would have been lucky to get more than 2 Mbps... i work from home and need the internet but why am I paying so much for fixed LTE when you do not hold up your side of the deal... I have phoned and complained and even screamed but Cell C's customer service is some of the worst I have ever seen... and then on top of that they make it impossible to cancel your contract because they know they will not deliver. How can i get bad speeds and then since five days ago its gotten even worse don't they have any loyalty towards their customers... and to top it all off none of their technical consultants can explain to me why my internet has gotten so bad. And just to clarify i have 2 routers from them one for fixed LTE (4G) and the other a pocket router (Where if i might add went from 8 Mbps on 3G to 0.5 Mbps over the past 5 days). I'm sick and tired of talking to technicians that don't know what is going on, i need answers and no one can give them to me!!!!!