Very unhappy with service received

My claim started on the 26.04.2019. Storm damage to building where my roof was affected. The claim was logged. And they sent out Dalumi contractors to my premises to assess and repair. They have been back to my premises 4 times including recently and the issues still persists. I then logged a complaint with Standard bank insurance and they then sent out a roof inspector(JBC roof specialist) that picked up that the entire roof damaged. Dalumi contractors only repaired one section.(semidetached) Also now I have resultant damages that is getting worse as we experiencing electrical problems as well. I have expressed my concerns regarding contractors used but I was told they unable to change contractors on my claim. I really do not want those contractors at my premises at all. I think they have been given enough chance to sort out this problem. I please need the above resolved ASAP as this now is an ongoing problem for 11mnths.