On 17/09/2017, i cancelled my Landline. My ITC hasnt been updated and now i am unable to appl for a homeloan

In 17/09/2017, I cancelled my Telkom Landline. On 25th Jan I had to go into Cresta Branch again to cancel it. and send email 3 times to cancel. Now my ITC hasn't been updated and as a result I am getting a bad Credit Rating even though I ALWAYS paid extra on my Telkom Account. I need this sorted out IMMEDIATELY and a letter sent to me. Today I held on for 15min, speaking to Siyasanga in billing. As soon as I said transfer me to Supervisor, little while later she dropped the call. I called back and waited for 23.54min with my cell phone airtime which is also now finished.