Very disappointed with Budget

The staff at Heathrow failed to explain the cost breakdown leaving us to figure it out ourselves. We still don’t understand why the surcharge was higher when we opted for the full insurance coverage. The staff also failed to realise the car chosen has GPS installed and still advised us to pay for the external GPS device. Also the staff didn’t explain clearly the procedures of dropping off the car and the Postcode provided failed to lead us to the correct drop off point forcing us to ask people around us and hotel representatives to resolve the issue. Also when we had an issue with the car and called the hotline, it took a long time for a representative to pick up the call and the responsiveness was slow and the service was appalling as no one called back after seemingly a phone connection breakdown.