Telkom service sucks!

After numerous reports of a noisy phone I was told by the technician that the problem was the line filter and that I should go to a Telkom outlet and have it exchanged as it was still under guarantee. I went to Telkom this morning only to be told that the filter is not covered by the guarantee although it is sold as part of the modem package, and that I must buy a new one. I then reluctantly agreed to buy a new one but the shop assistant then told me that they can not sell me a new filter as their computers are down and that I must come back later!!! What nonsense is this? I went to a computer shop where I got a new filter but, yes you guessed it, the noisy phone is still with us. There is no way I can complain directly to Telkom via e-mail because it seems they have a non-existing customer care. I would love to see Telkom's response but have my doubts to ever see this happen.