Shocking LG return service

My 55" LG TV stopped working two days after installation. I booked a service call with dionwired Hyde park, providing proof of purchase and a pic of the TV's serial number. The technician told me the mainboard stopped working on the 15th May. On the 16th May Diana from Panaservice called to inform me that an exchange was authorised and that i can take the form she has emailed, with my broken TV and get a new one. I borrowed a car and took the 55" to Dionwired Cedar on the 18th May. Calvin the manager refused to exchange the TV as he had to confirm the exchange with LG first and they are closed on Saturdays. I left the TV behind. On 22nd May i phoned Frederick and was told they are still waiting for LG. I then phoned Dankie at LG directly and she confirmed my valid reference # and the exchange, promising to phone Dionwired. Later that day Kena from Dionwired asked me to send proof of payment again as my attachment can't open. I told them i don't have a scanner and asked them to phone Dionwired Hyde park if they can't open the invoice on their side. On the 23rd May I phoned Frederick and he said he is waiting for LG for a credit note. I immediately phoned Dankie at LG and she blamed Dionwired for not receiving the proof of purchase yet. It has been six days since i have received the authorisation for an exchange and i am still waiting for my new TV !!!! No one is taking responsibility and blaming each other !!