Calling me to put me on hold

<p> Last week I placed an order on Telkom's website. The next day, I received three calls from their call centre. Each time, the line was silent and I hung up after about half a minute. They didn't contact me again. Then, today, I placed the order again. This afternoon I received a call from their call centre again. Again the line was silent, but I held on this time. After almost 5 minutes, 'on-hold' music started playing. Then, after almost 10 minutes, the call was ended from their side. It is one thing to be put on hold when I call them. But it's much worse when they call me just to put me on hold.</p>