Impossible to get hold of someone who can help!

In December I received an unusually high municipal bill. I have written three requests on their website to contact me to discuss the bill, have phoned all three numbers I have at my disposal to try to talk to someone about the bill AND sent an email to the address I was advised, but have received NO RESPONSE to any of it!

I paid my usual amount, not the full amount, but today, without notice, my water and electricity was switched off!

What do I have to do to contact someone who can tend to my query???