Smartvoice phone,not very smart at all!

Beginning of March 2020 received a phone call to say our land line to be upgraded to a smart phone handset; this was duly installed and we were told we would have 2 GB wifi per month. This was installed and we had wifi. The wifi ran out towards the end of March. We didn't worry as we knew the next 2 GB would kick in at beginning of April. Except it didn't! When I try to get in with a device I'm told I have to buy more. I have phoned the suggested number - 081 180 - and was told to phone a different number. 4 operators later still no help. Is this some sort of ****??