Unable to cancel contact

Unable to cancel contact, thought I was paying month to month, however they refused to let me cancel within a few days. I emailed them and they agreed to cancel however then a month later I noticed that they were still taking out payments. Now they are demanding $250. besides the monitory aspect of this app, it is a very poor quality app it works not very well with messaging, it’s buggy, the selection of people is very poor as it doesn’t have a widely used platform. Being a 26-year-old male there was only around six people my age in the platform and I live in a busy and populous suburb and part of New South Wales. I have sent multiple emails explaining this however they are not interested. This bunch of con artist work by their marketing on television and on social media, however it is a very poor platform to look for a relationship much more recommended would be a platform like hinge. Especially for younger adults.