INCORRECT BILLING DUE TO SWITCHED TELEPHONE LINES

From August 26th our telephone lines have been down. Contacted Telkom on 02/09/15 and was advised of cable theft. On 05/09/15, Telkom had sent an sms advising of infrastructure upgrade and apologising for the inconvenience. During this so called upgrade, our telephone lines in the area were switched. Telkom was contacted again on 15/09/15 regarding this matter which got rectified on 23/09/15. During this period whatever calls were made by the telephone line that was switched with mine, I was billed for the calls. Telkom was contacted on 06/10/15 regarding this incorrect billing but has not been rectified. Called again on 02/11 and was advised this query is still opened. Kindly attend to this matter urgently. The calls usage billed in Sept and Oct account is incorrect as these calls were made whilst the telephone lines were switched. Telkom had cause this problem, now please rectify it. Kindly refer to reference numbers: 124CNZ180915 AND ***5. The second reference number is till opened as per Telkom.