Very bad telephone service

I want to book a holiday with first group using my accumulated first group points. I phoned the contact center multiple times to try this, but the call keeps dropping. The first attempt I got through the switchboard to first exchange, after which my call was dropped at about 20 seconds into the conversation. The next 4 attempts switchboard put me through to first exchange, but the call wasn't answered and the line dropped at about 1minute55 every time. The last call I held and waited for someone to answer for 7minutes50 , then the call dropped again. I find this pretty bad as the first thing the operator says when picking up the phone is "how can we make you smile". I want to perform a simple task. Book and pay for a holiday. Not possible over the phone it seems...