Being billed for months that Telkom suspended my service on a "MONTH TO MONTH" contract

I had a "MONTH TO MONTH" Contract with Telkom for my ADSL line for the past few years however, in January 2020 my line was suspended due to non payment which I completely understand as you have to pay for what you use. My balance due to on my invoice as at end of December 2020 and by 13th Jnaury 2020 they suspended my line only to find that they kept on billing me for February, March and April 2020 even though my line was suspended so how the hell can you charge me for a service that you have suspended and I cannot use especially given that this is a month to month contract. My invoice now stands at R4741.00 ARE YOU KIDDING ME????Can someone please correct as I must emphasise, this is a month to month contract. I have no problem paying for the months that I dud use but you must be f&*^^%ng crazy if you think that I am going to pay R2000 for f*&^all. Please ensure that this is correct so that I can get my account up to date.