Disappointing service

Unfortunately my claim for my son's claim has been extremely painful, I have been unable to resolve his claim since February, each time a new excuse, new document, nee reference number. Call centre is extremely unhelpful and all they say his sorry please call back in a few days! Latest is they can trace the last ref number .... Which I received via email, I was promised that a supervisor would contact me,and nothing!!!! No call lines to go to higher management, constantly blocked from speaking to someone above the call centre!4months I have been trying to resolve this claim! I have already had to cover a huge amount that you declined after I paid the 30% none DSP Fee which YOU gave the hospital to later receive ANOTHER bill !