Complaint About Unfulfilled Loyalty Credit Promise and Inconsistent Agent Information

I was advised by an agent through chat to switch to a different plan. Since my previous promotion was ending, I was considering moving to another carrier, but during the chat, the agent offered me a new plan. I was also promised a $15 monthly loyalty discount. I asked to have this discount included in the contract, but the agent said it was not necessary and assured me that the $15 credit would be applied every month.

However, on a different day, when I spoke with another agent through chat, I was told that this credit is not applied automatically and must be added manually each month.

When the first month of the new plan started, the promised credit was not applied. During another chat session, yet another agent told me that such a credit does not even exist.

The only reason I did not switch to another carrier was because I was promised this credit, but in the end, everything I was told turned out to be false.