Depleted Data Bundles

Good day Vodacom. Please return my data bundles. I own an iPad for which I buy monthly 1GB data and all along this lasted me over a month. On 14 August 2015, I purchased 1GB, it was gone within 2 days and I did not even use it as I used my iPhone for the internet. Friday, 11 September 2015, I bought another 1GB but used the Cape Town Slow Lounge Wi-Fi(you can check my records if you want) to do all Apple Store updates. This morning, 13 September I was surfing the net and told data is fully depleted. I only browsed twitter and facebook, and even then it was also partly on my phone. Kindly return my 2GB of data cause this is unacceptable. Don't tell me to contact the call centre cause my phone is on MTN and I can't make calls on the iPad. I'm not going to waste my MTN airtime calling the Vodacom customer care as the phone isn't even picked up at times. Please assist asap as I need my data to use the internet urgently, my iPhone screen is too small for certain websites. My iPad number is ***. Please also notify me once its returned. Thanks.