Ask an Property Solicitor. Get an Answer ASAP.
I am a solicitor and will assist you today.
Have you contacted the building manager about the increased cost?
I am glad to be of help.
You may raise the issue with the building manager and ask them to make up the difference or face a claim from you for the difference.
If the lift broke down due to their negligence, you may try and recover the extra cost from them as damages.
May I help further?
You may point to your tenancy agreement and say that there was a breach of contract by them failing to ensure that the lift was working properly at all times.
All the best