Delays with Installation

Has anyone else experience delays as a new customer with the installation of Virgin Media. My parents Signed up for Virgin media on 21st May and the original Install date was for 26th May. This has been delayed so many times that the now proposed install date is the 16th July. they have not been given reasons for the delays. Personally I find this level of service unacceptable. They are not able to extend their contract with their previous provider they will only accept a contract renewal. My mother is a nurse who works long, high-pressure 10 hour shifts and the ongoing delays and lack of clear communication are adding unnecessary stress to her already demanding schedule. It has got to the point where she is calling me in tears about this appalling service.