Not delivering the service I am paying for

My line speed at Webafrica was upgraded to a 200/100 MB line on 6 March 2021. But that lasted for only 4 days, and my line speed was back to 100/50 MB. I had to struggle with your useless Whatsapp service to try and get it resolved but the agent just could not help me. I had to actually CANCEL My service to eventually get any help from you. And so my line speed was back at the correct 200/100 MB on 18 March 2021. BUT Tuesday (30 March 2021) my line speed is again down to 100/50 MB !! Again, with your Whatsapp service, it is a back and forth, and I have to repeat my problem every time. I have now logged this issue more times then I care to remember. You tell me your dashboard shows me as 200/100, but that OpenServe still sees it as 100/50. You told me yesterday it will be resolved ASAP - but 24 hours later and NO Resolution. You are very quick to bill me and make me pay for a service YOU ARE NOT DELIVERING. You are just as quick to tell me how sorry you are to hear of my problem, yet it DOES NOT GET RESOLVED. WHY is this not resolved? WHY must I continue to log calls with no help from you? WHY am a paying for a 200/100 line when you only provide me with a 100/50> Technically YOU owe ME! Frankly, I find it ridiculous!