Where is my data?

On 23 April 2015 I bought a 500MB then a 3GB followed by a 500MB again as I wanted to use up the airtime on the number. On 30 April I bought another 1GB to last the day out. Except for the 3GB I bought on the 23/04/2015, none of the other data registered even though the dashboard message clearly stated that the purchases were successful. I sent an sms through the dashboard but have had no response