Bad service experience

I have been struggling to get my contract cancelled now for 2 months.In the beginning applying for a Telkom contract was easy and really enjoyed the speedy device approval and benefits. Close to my final 2 months on the contract i went into the store at The bridge in Port Elizabeth to ask advice on whether or not i should upgrade or just go on a pay as you go option. The consultant advised that from his experience a lot of clients cancelling their contract are being incorrectly billed penalty charges for early cancellations even though they are in the prescribed month notice and I didn't want to be part of that mess up so he instructed me to not upgrade and keep my benefits of 5 gigs of data and 100 minutes on a month to month basis as I is a good deal for only R269 per month.I have 3 lines with Telkom 2 Samsung s4 mini contracts which is R269 and a lenovo data deal for R229 per month.Month after my final contract date to my shock I was billed on the 30-10-2015 R1257.32,25-11-2015 R1023.12,15-01-2016 R1395.50.So even after i went into telkom to give my consent and start with the cancellation process on the 19.11.2016 im still being billed and for me unexpected financial loss.