Wrong data provisioned on contract

I updated my contract on Feb 2024 to a 120gb data but from last month it was changed to 40gb. I get two sms's that state that the 40gb and 120gb is provisioned but only 40gb reflects. I've called numerous times but I am not getting helped. Everyday I am told a different thing. I rather cancel it and default on this contract. I will just change my banking account. I can't keep doing this. This is the pits.