Not refunding my money

WE have resigned from the scheme in January but debit orders kept being deducted from our bank account, after hundreds of emails and phone calls, eventually we got the debit orders stopped at the end of April. Now since April we have been phoning and emailing asking for our savings money to be paid back to us. Every time we phone we have been told we are on the next payment schedule. <br> We are so frustrated with this response every time we phone we feel like going to the ombudsman or opening a case of theft against the scheme as it is our money and they are not paying it back.