Refunding of a rollatot

I am strugling since May 2024 to get DH to finance a mobility assistance as a out of hospital item. I forwarded a PMB application completed by me and a general practitioner as well as a motivation by a orthopedic surgeon. DH then requested a nappi code as well as ICD10 codes. This was supp**** to them. After all of this my application was declined and the reason was this equiptment does not qualify as PMB. I realised that a scooter is to expensive and on recommendarion of a consultant of DH I bought a rollator from Dischem with the understanding that I will be refunded in full by DH. After I put in my claim it was declined and further motivation was requested. I completed a PMB form and it was also completed by a cardiologist. This claim was also declined and I lodged a formal dispute. Now I received a letter from DH that they wanted motivations from doctors regarding my condition. As I allready supply them with letters from a GP, orthopedic specialist and a cardiologist I really cannot understand what they want anymore. It does not help to call them as their consultants are fully incompetant for their task.