Behind with Payment now suspended us.

We have Internet at our Home. We do everything through MWEB. Now we pay everymonth R469 at Mweb that is what the Data and ADSL line cost. Now yesterday, 23 February we got a sms from Telkom telling us that they suspended our line because we are R1534.43 behind with the Voice line at Telkom. We knew nothing about that we must pay a voice line at Telkom they only informed us that we must pay R469 for MWEB because we do everything through them. Why only now they wanne tell us we are behind after 6month? When we called they say it is a standard thing if you have internet to have the voice line but how must we know that if they don't tell us listen you also have to pay a monthly fee to Telkom for the voice line. Please look into this cause this is nonsence. Line number is ***