Telkom Poor service

I have a contract with Telkom which states that i will have 40gb of data for day and 40 gb data for night, For the past 3 months my data depleted on the same dates which was mostly the 18th I logged in and check on my Telkom app this morning after data was allocated I noticed that my data was allocated but it was shot with 20gb, I called all the Telkom customer care lines only to chat with a chatbot and the call get hanged up.