Wrong billing

I am utterly disgusted with the service from telkom . I asked for my SERVICE to be cancelled on the 5/2/2020 . All i get it query is being escalated . I have been charged wrong since day 1 and dont want to deal with them . Today i get a statement and still being billed for service i am not using. They should rectify my account balance then i will settle ! Ive been charged R200 device subscription when it suppose to be R49 . My internet package amount is wrong . I dint get any calls from them .when i went online to cancell it says servuces suspended so i cant cancel. If its suspended why am i being charged for a full month of usage ?