Billing confusion

In the first week of May I registered a dispute with Telkom about the landline bill of no: ***0 which was under my name before I discontinued it in year 2013.They tell me I owe them R291.14.Now surprisingly this has never come up in any other time before,not them informing me in any other way-letter,phone,email or otherwise until now in May 2015 when I wished to add on the existing contract.This contract was signed with them in Aug/Sep 2014 and then never owed them after credit check.I needed to add three phones in and was told the dispute will take 2-14 days for it to be resolved and will be contacted.Yesterday I checked and my dispute hasn't been attended,never been contacted.Now what disturbs me most is that the package I needed expired yesterday and the application was done on the 4th/5th of May.Is this inefficiency from Telkom or what. I have left Cell c and Vodacom hoping for a good and better service and respect from them as a customer and this is what I get even before going any ****her.Is it worth, I am asking myself and where do you go for a good and better service really.Is this just a hiccup or is this the kind of service they provide? I am so disappointed.