Mistreatment of Dementia Patient

My 80+ year old mother has dementia. She fell and was hospitalised. The doctor prescribed a walking frame, for which we app**** at GEMS. We did not receive any response until I called and had a temper tantrum, only to be told that the approval was sent to her phone. the day my mom was diagnosed with Alzheimer's, we immediately went to an attorney and my mom assigned power of attorney to me, which I provided to all companies, GEMS included with a request that any correspondence should be sent to me. Of course GEMS ignored it. The Alzheimer's eventually developed into dementia, where we are today. On the 13th of July 2018 I submitted everything required for payment to mom (we had to purchased the frame cash as the company refuses to deal with GEMS). On 26 July I called Nicolene who argued that I only submitted the claim on 22 July (I have proof of GEMS,s acknowledgement of the claim on the 13th). on 7 August I spoke to Raylene, on 10 August to Stephnie, on 15 August to Rowan, on 16 August to Sarah-Lee, on 18 August to Naish and today to Francois. Every single operator had a different excuse or problem and today I lost it, because today, apparently there is a problem with the nappy codes: which is exactly the same codes that was initially approved by GEMS. I don't have the money we had to pay for the frame around to play with and we need to purchase my mom's medicine, for which of course, GEMS also do not pay, but they are taking their time and coming up with new excuses every time. YOU gave approval and now YOU are *****ing an elderly's money! What will your next excuse be? How long will you still delay payment? Do you like it to abuse an elderly dementia patient?