NO COMMUNICATION

I have being out of the country for a few Months Vodacom have billed me for a huge amount when i have not being using my phone during the period of billing. I contacted Vodacom at the time whereby the Customer Consultant was at the time going to block my number and then get someone to come back to me .. I ve in turn sent emails asking for correspondance at I stage I got 1 responce saying it wasnt there department and they would send the query to the correct department. Now I get a letter stating if the outstanding amount is not paid within 7 days there will be consequences.<br> <br> I cannot phone Vodacom as im out of the Country and my S.A number is blocked. Vodacom does have my email address as theyve sent me the letter to settle. Please can Vodacom not contact me on my International Number and at least reply back to my emails.. I dont know how i can possibly owe this amount as i havnt yoused this number in months however without Vodacom communicating with me how can this be sorted. Am i just expected to pay a amount that i know nothing about???