Call centre not answering - cancel contract

Hi there, we are trying to cancel a cellphone contract by the end of this month. All the relevant paperwork has been sent several times to [Email Removed] and I have had automated confirmation that it has been received. I spent almost an hour on the phone yesterday without anyone answering, only to find out when contacting one of the franchises that they are all on strike - and have been for the past month or so. THIS IS OUTRAGEOUS! How do I get hold of someone who can make something happen? Regards