Sim blocked

I bought a ****le and a sim card two years ago to be used when I go on holiday in DBN where I have no access to ADSL, I have been putting money on the sim card but have not been able to connect for over a year. All the payments have been paid from my bank account to the prepaid cell number of ***. In January I called the call centre and told them I keep putting money on the sim and it is not working, they still got me to put more money on and still did not work. They told me to go to the nearest Vodacom as maybe the ****le or sim is faulty. I did this only to find out that my sim had been blocked and notified by the store that if you dont use a sim card by a specific time frames it is blocked, I was not made aware of this. Now I would like to know when was it blocked, (it is rica'd) why did no one notify me of this, why had Vodacom been accepting the monies from my bank account ALL THIS TIME for a number that is blocked. I would like a full refund of all the monies paid to Vodacom for a service that was not supp**** or used