BILLING

I completed a order form from Neoteol on 14/07/2015, only received the wireless wifi device on 11/08/2015 - On 05/08/2016 I cancelled the contract without ever using the device. the Device was returned to Neotel and I allowed September debit to go off. however, my account was debited nonetheless going forward until I blocked them with my bank. needless to say, my account was still not cancelled. today, 15 March 2016 I get statements from Neotel and phone calls from its debt collecting company for monies I do not know where they come from as my contract was cancelled on 05 August 2016. I've emailed its complaints department, accounts department ect and NO ONE SEEMS TO BOTHER. THIS IS FRUSTRATING!!! FOR A WHOLE 7 MONTHS!!!!