Pathetic service and incorrect information on hand

Brooks and Luyt keep on sending me settlement sms's of 50% discount. Once you contact them, they say it was in error please ignore. This has now happened 3 times. The first one when they said ignore please, the following month the consultant confirmed no it was correct. But now it is back to 30% discount. So I lost out on the 50% discount due to the agent giving incorrect information and I need to be on the receiving end as I could have settle it then were the information correct.