Billed for service not received

Had a fixed rental land line from 2008 to date. In May 2015 app**** for home ADSL. Technician arrived at 6pm when the office is closed, he did not know how to do the installation. He promised to arrive the next morning and never did. I have inboxed telkom via facebook several times, visited the northgate branch several times. Ally the manager is not interested in assisting. 18th July went again to store to return the unit and cancel the home adsl and requested to be reinstated to original fixed rental. Nothing was done. Went to store again Sat 8th Aug. Consultant could not assist. No one ever answers the 10210. Received bill today amounting to R1699.80. Nothing has been done as yet to resolve this. Telkom Account no : *** , ref. no. for rental credits ***5, if anyone would care to assist