Threaten me with legal action on cancelled acc

Being MWEB client for many years and we have been using Mweb for many services for our clients. Instructions was given to email cancellations@mweb to cancel product, now this year in Jan i emailed my cancellation with 30 days notice so in writing. few weeks later i get a call saying i need to do this online... i asked the gent so its been 2 - 3 weeks after i cancelled. So this meanse i need to yet again give you 30 days and the still pay for addition 30 days? So this would them make it 60 days notice from what i will need to pay?? I was just advise it is what it is... Sorry if MWEB is slow no ways im paying for your delays. Now till date explain this to 10 - 15 people i still get RUDE phone calls demanding money. Please can you get your Legal department to stop harassing me !!!!! I gave you written NOTICE in WRITING TO YOUR CANCELLATIONS@MWEB account as always been instructed. If you change your way of doing this, its not my problem. Especially not if in your email you acknowledge you got the mail