Poor service

My Dialdirect insurance policy was amended to combine my building insurance and vehicle insurance, about 2 weeks ago. I was told to contact the Cancellations Dept. to cancel my previous building insurance that was amended. I have contacted Dialdirect telephonically and via emais through the app. on numerous occasions, however they were unable to resolve the cancellation issue, saying that that Cancellations Dept. was busy and they would contact me, but they didn't. I have addressed my concerns to the agents about being billed twice for the building insurance. I have also indicated this on my emails. I have since been billed twice this month for the building insurance. The issue arising with having to request for a refund could have been avoided, had Dialdirect provided a basic service with the cancellation. It is annoying to see such pathetic service.