TELKOMS FAULT WITH INCORRECT BILLING

last month we received a bill of R80 for Telkom, we as do keep record of all payments ect and called them ask whether it was correct. the agent then indicated that it was infact a correct reflection of the amount owed to Telkom, i then asked my husband just to confirm and call again as i was sure we owed the normal amount of R605 for the month of august, this agent then too confirmed that it was a correct reflection on the statement received and because telkom was offline for 5 days, it would show. in anycase i usually pay r300 a week onto my telkom account so that i am always in a credit. Today my husband received a bill from them indicating we owe them money for two months which is due by the 1st of October, he then called into Telkoms Customer and the agent indicated that the R80 bill was incorrect and we failed to follow up, least i remind them that their calls are recorded and they can obviously go back and double check that we had infact called in to enquire about the incorrect billing. i would like this to be sorted and for them to work out their account correct including the ZERO charge for the time we had to access to their *** wifi services in any case