Notice to cancel and yet billed for full month

Hi ,<br> <br> My contract expired on the 25 October 2015 and i was advised by the call Centre - 808 to call a month before which i did and then i followed up on the progress the end of September , i was told to phone to cancel on the 1st October 2015 ,Which i did the day my contract expired ,i then was told they have a backlog and the retentions department will contact me and while i was waiting to conclude the contract i was billed for a phone i finish paying for in September. i received two emails from the retention's team a week apart asking the samethings which i answered . i Contacted the call Centre and stressed that this matter be resolved and told them who's gonna pay for my bill while they sort out there admin as i need to use my phone too and was informed ill get refunded,my number i was migrated to Pre -paid debited for R1200 and i cant get a consultant to assist and the prepaid line 173 cant help. I need this resolved my phone repairs already took a year .