Higher premium with no notification

I have a policy with Dotsure since 2017, there service was personal and very professional when i joined them, recently the service has become unacceptable in many ways, a claim was processed of my insurance without my know and today I just received a sms stating they are going to debit my account with a higher amount that I was not advised off. Can we get the service we had a Oakhurst back, please call me urgently.