Pathetic service

Took almost a month for installation of a fibre line to take place...since installation took place on the 9th August.. the line has only worked on the 9th August...10th August offline,logged complaint...line fixed on the 12th August...13th August offline again...complaint logged 14th August,line fixed again...15th August offline again...complaint logged 16th August...line fixed 18th August just before 11am,only to go offline again after 5pm same day. Service is pathetic,I'm paying for a service I'm not getting any joy out of...in the meantime my voucher I paid for is running out. I have made so many calls & even sent emails to employees n management @ vumatel but still im sitting with the same problem. My time,money & energy is being completely wasted here. I keep telling them the problem is "DNS address not found"...last employee I spoke to @ vumatel said she will get a technician to come check out the issue as she can see on the system the line installed is not stable...I'm still waiting!!!