not taking responsibility for a claim

About a year ago absa sent out contractors to fix a burst water pipe and tar the area affected.That area was flooded with water and over the past year that water had an effect on the sand and the sand underneat the tar sank abit whitch caused the sewer pipe that was in that area to sink a little which caused a blocked sewer.On the 25 October 2015 I phones absa and told them that I have a pipe blocked and the said I must phone on monday as its not and emerengcy so I phoned on modat and they sent a crontractor who said the sewer is blocked and absa doesn't cover sewer so I got my own plumber who came a fiexed the problem and told us that this problem was caused by the pip sinkin and that the previous contractors didn't secure the pipes before taring.I phoned absa and spoke to Mphou Skosanna who was not helpful and made me wait on the phone for so long.I had 2 phone numerous times and after 2 weeks I got some one who said they will sand an assessor out to see as to what I was telling them is true.The guy came out and he made a finding that absa must pay me back my money I spent on my plumbers.I then phoned absa after a week and still no answers and they make u wait so long.Service bad