Changed my contract unilaterally?

<p>I recently discovered that my wife is running up out of bundle data rates on her cellphone bill, which led me to discover there is no longer a recurring data bundle on the cellphone contract I took out for her.</p> <p> </p> <p>I asked Cell C and they claimed I had changed billing plans at some point. I denied this and requested documentation showing this change. I am still waiting for this documentation!</p>