Unhappy client

My husband app**** for a rain internet sim card in October and it was delivered. He could not activate it and I called them several times without success. After several attempts I got hold of them and they promised to call him so that they can activate it for him but they never did. To my surprise I checked his account and it says he's behind with a payment but he did not use their data and I believe they can see that on their site. They are quick to charge him but to resolve the matter dololo. He is not going to pay and they will reverse the charges they made on his account.