web africa false billing

i had a lte service with web africa for 6 months is 2019 , in may 2019 they moved away from cell c as their upstream provider to vodacom . my lte service was not working for the entire month and their support desk could not deal with the huge call volumes , after cancelling my month to moth contract with them in writing due to terrible support and no service , i recieved a bill from them for R1700 for the issuing of a new additional sim which i never recieved and no longer required as i had moved over to mweb for a better deal as of 1 june 2019 . i refuse to pay for this claim and i will certainly sue wefafrica asap should i be listed on the credit burue ,clearly their staff are clue less as to what they are doing . well done web africa lets go to court , im so ready for this . Most terrible isp ever ..