Cancel My Non-Existent Service Please !!!

Every Second Week I Don’t Have Internet. Your Support Agents Don’t Assist With Anything But To Tell Me That My Tower Is Down. I Was Debited On The 1st Of November Then On The 2nd I Suddenly Don’t Have Internet AGAIN… Your Support Agent Was Nice Enough To Tell Me That A Technician Normally Calls Back After 7 Working Days, Imagine. I Requested To Cancel & I Was Told A Retentions Agent Will Call Ne Back In 4Hrs… Im Still Waiting. I Just Want To Cancel The Service ASAP.