Telkom not connecting my new ADSL

In December 2017 I have app**** for Telkom 4mbps ADSL. Only a week ago they installed my line after numerous phone calls etc.

On Saturday when the installation was finished I contacted Telkom to activate my line and they told me now my account is suspended for not paying from April this year...

How can I pay for a service I have only received this weekend?

I have phoned Billing now and they cannot help me and referred to Sales. Sales cannot help me as they say its the Billing Department's issue. And Technical need them to sort it out in order to assist me with my issue...

Can somebody please get this sorted...