No response - overcharging

Monthly subscription went up in May on a fixed term contract without notification. Query raised through support on their website 7 July 2015, query raised 3 August 2015 and last one on 7 August 2015 - status remains open as of 7 September 2015 on all three queries. <br> <br> I decided to run a report to check what I was being charged for in calls and data usage. According to my calculations I was being overcharged and so I sent through the spreadsheet with formulas showing the overbilling and raised query by telephone on 13 August 2015, after numerous calls I was given a new reference number on 27 August because the consultant didn't include my query or contact number on my query logged 13 August - bearing in mind that they were supposed to respond in 2-24 hours according to call of 13 August.<br> <br> Called again 7 September to be told to phone a new number which doesn't work, called back to be hung up on and on the 3rd attempt I got through to a consultant who has now requested billings department to check and if they find I am correct they will refund me - nobody can return my call or let me know the result - so now we wait for 7 days to see if maybe I get a refund !!