Worst Service Ever, so dissapointed

I have been struggling to get a policy change and debit order sorted out with Mi Way for the past 6-8 weeks. I have made over 25 recorder phone calls to try and sort this out, but they keep messing it up. Up to now it is still not sorted out!!! Every time I insist on speaking to a more senior person to try and complain and get it sorted out, they apologise profusely and promise that it will be sorted out. I have spoken to so many call centre supervisor, and still nothing is sorted out! It is ridiculous!!!!! The last supervisor I spoke to promised that he would get his senior to contact me. Guess what.... NO ONE has contacted me!!! I am seriously fed up with their bad service. I am at the point of cancelling my Policy with them!!!! Pathetic!!! I can also bet that they will not even look at or respond to this complaint. Customer Service means nothing to them.....Angry And Upset!!!!