Despicable and Poor Customer Service

I registered for a membership with this gym effective 1 June 2018 my contract clearly stipulated that the first debit order would go off at the end of the month (30 June) however the deduction went off in May and returned unpaid. I explained and provided proof to the administration team to correct the error however the query was not attended to. I went in today to enquire if my query was attended to and I was advised I owe which I was advised that it had not. Furthermore there are various features sold to prospective clients such as the free WIFI facility which is none existent. I've tried on a number of occasions to bring this matter to management as this poor service seems to be a norm. I advised them that I'd like to find a different service provider that actually caters for client needs as this one doesn't. I was threated about the 24 month contract that I'm bounded by.