Assupol provides poor service

I’ve been having some issues with Assupol on my policy, I ask for changes to be made but they don’t seem to be done. I paid double the amount this month because of that issue. Now it turns out my policy is in advance. I’ve been calling but they are honestly either not going through or I’m taken from one consultant to another like this morning. Can someone call me to discuss this and get my refund if required? Cause when I miss my payment, Assupol is always fast to communicate but very slow when it comes to calling me back to clear this. Can I get someone to call and sort this out urgently?