No Reply from UA

I am very upset and disappointed in United Airlines - UA. My wife and myself made a booking via Flight Centre for a return trip to Vancouver -YVR, Canada, leaving 31 May 2025, returning end 22 July (which changed to 26 July,) 2025. On the third leg to YVR, from Seattle- SEA- to YVR (UA used Air Canada - AC)- and both our names appeared on the boarding list, however my wife's ticket did not pull through, so she could not get a boarding past. After more thnt 90 minutes running around SEA airport between AC and UA check in counters to get my wife's boarding pass sorted out, we ran out of time and a Supervisor of UA suggest/advise to cancel both our tickets between SEA-YVR, reinstate all other return flights and then we can claim the refund from UA on our return to SA. On our return, we contacted Flight Centre and ask them to put a claim in with UA for a refund. We also, on 1 September, contacted UA direct for the refund. We do not get any reply from UA, except that are busy sorting it out. Does it take more than 2 months for an Airline to sort something like this out? UA also have limited mail contact options, and it is frustrating to communicate with them. I hope we can get their attention now. Nico