CANCEL DSL ONLY AND CONTINUE VOICE SERVICE ONLY

I instructed that my DSL be cancelled effective 28/09/2019. NB: MY DSL ONLY!! I therefore did not instruct any cancellation of my voice service and instructed that this continue in place. After speaking with Bongani on 12/09/2019 reaffirming this instruction verbally, I received an SMS from Telkom immediately thereafter requesting a deposit of R700.00 to proceed with installation. I have no idea what this is about??? I expect Telkom to do as I instructed and as agreed by them, namely to CANCEL MY DSL ONLY on 28/09/2019 and to continue with my VOICE SERVICE ONLY from 28/09/2019. Please contact me to confirm my instruction. Thank you.