Poor Telkomsa.net control

I just cant deal with the amount of spam and phishing emails coming through to my telkomsa.net email address. I lodged a complaint many months ago, and had to submit a long list of the sender adresses. But since then it has just increased. and I get between 10 to 15 of these per day.. I created rules in Outlook but it still comes through. I have other email addresses and none of them have this issue, only telkomsa.net ones. If Telkom cant control this I will have to stop this email address, which will incur a huge problem for me, as it is my primary mail. TELKOM, YOU HQAVE TO DO BETTER!!!!!