FedEx + Customs delay

I ordered a guitar from the US on 04/04/2018 with a view to taking it on a vacation trip on the 13/04/2019. Was assured by the buyer that the package would arrive in time. As per FedEx's tracking tool, delivery was estimated at 10/04/2019 by 6pm. A few hours before the scheduled delivery, I received an update on the tracking tool to say that there is now no known date of delivery. I called FedEx South Africa the next day and they informed that the package is now at customs and that they cannot confirm when the package will be released, but that I am unlikely to receive it in time for my trip/for it's intended use.

My grievances are as follows:

1.) Lack of communication/correspondence. Following the failure to meet the initial scheduled ETA, they failed to update me as to why there was a delay. I needed to call them the next day. Website/Tracking tool says package is in Britain, in transit!

2.) They are unapologetic about their failed service delivery.

3.) They failed to provide any sort of solution. I asked them if there was a way I could expedite the process or contact customs, but they simply rep**** "no".

4.) I have used alternative shipping services (namely UPS) and they were 1.) proactive in facilitating customs clearance smoothly, and 2.) kept me updated along the way, with one of their staff members contacting me telephonically to let me know that the package had arrived in SA, providing me (pre-emptively) with the necessary forms/payments required. So FedEx has seriously disappointed me here.