Afrihost doesnt really assist when their are real problems

Logged several calls for pathetic fibre lines with open serve. Was told it was my modem, so that got replaced, still had same issues. Paying for a 40 40 line and receiving buffering lines on 0.5 to 11 and cant even use this lines for my phones or computer as it constantly buffers. Im just being told constantly i must change equipment but that just doesnt solve their pathetic lines and constant calling them to try and rectify lines, and to my surprise they constantly close the complaint as solved without doing anything really. Now we cant even get hold of them as when they call their own line drops as well.