Claim for data rejected

Since October 2017 I’ve been struggling with my dsl internet connection. I’ve decided to leave my previous isp and join Telkom. I was under the impression the problem is with my isp. However, this didn’t resolve my problem. Since then I’ve logged numerous faults and the technicians visited many times but couldn’t resolve the problem. I’ve bought R3000 data because I didn’t have a connection! Especially from 6pm to 6am. This was the main problem. I’ve claimed my data from Telkom but they rejected it because they “see I’ve had an internet connection and that I have used data!! How absurd is this!!!???? All faults logged was for the same problem. The technician I’ve dealt with have records of all faults logged! Why can’t Telkom properly do they’re work and investigation!!? I don’t know what to do!!??