Economy Car Rentals and Europcar not working well together

I rented a car through this company, payment was done online and I received my booking confirmation via email as well. EconomyCarRentals booking ECE14BA4. On the booking information they confirmed that I could pick up the car at the Europcar branch at Wonderboom Airport in Pretoria. I had to take a taxi to the branch and when I got there the branch was closed, even though I arrived before the time I booked for. After phoning the number provided on the door of Europcar I was informed that the branch is closed since it was weekend and that I had to go to the Hatfield branch

On the sign at Europcar that state the opening times they state that for weekend they open for pre-bookings, which is what I had.

I then had to organise another taxi at extra cost to myself to go to Hatfield, and in the process missed a meeting as well.

Why do Economy car Rentals state incorrect pickup addresses and then not contact me should it change. Surely they have a deal with Europcar and the two companies should sync their business arrangements. Europcar told me they couldn't contact me because they had no phone number, but Economy Car rentals does have my details, surely they should liase with each other.

The mistake costs me a lot of time and money that could easily have been avoided