Data bundle purchased - charged out of bundle rate

I had used up the 2GB on my contract and was going into 'out of bundle' rates so purchased an additional 3GB bundle. What has since happened is that this bundle has NOT been allocated to me and my service has been suspended. The contact centre advices me to purchase another 3GB bundle, reinstate the service at out of bundle rates and hope that <br> this 3GB will be activated<br> I will get a credit for the first 3GB bundle purchased<br> I will not incur any further 'out of bundle' charges. .