ADSL cancelled but still being billed

I have 2 ADSL lines , on 1 of the contracts the 2 year ADSL is expired and I am still getting billed without my consent<br> <br> I have cancelled both the ADSL lines [Email Removed] on the 18/03/2016 in writing with all forms submitted but I am still invoiced for both lines .<br> <br> I am not sure what to do as there is no more landbased walk in centres in my area<br> <br> This is getting stupid , when i call customer service they say they have not recieved the emails but i have delivery reports for the emails <br> <br> Can someone phone me <br> <br> Deon Scheepers