zero customer service

In December I wanted to upgrade my data sim (I upgraded the package and required a device) I requested an upgrade via email on15 dec..After numerous followup mails this was processed more than 2 months later on 20 Feb. When delivered it came with the wrong wifi device I followed up from 24 feb till April. OUT OF SHEER DESPERATION I have now used the device as iwas paying for data which I couldnt otherwise use. Since 26 April I have requested upgrade options for 2 packages elugible for upgrade...no response to date. Your service is SHOCKING!