Aknowledge my response when I refuse to increase my usage.

I have cellphone contract with MTN, every month they debit on time but I receive my airtime very late sometimes it's nearly the end of the month. To make matters worst I received and SMS on the 29th November as follows... Y'ello! We have not heard back from you regarding the setting of your usage limit. MTN's aim is to better your customer experience by enabling you to buy bundles and conveniently adding them to your bill. If you don't want your usage limit to be set, please reply 'No' to 30188, alternatively MTN will set your usage limit to R279 on 11 Dec'2019. #wegotu. To which I responded I immediately responded no. Today I receive exactly the same. If #mtn increases my limit, I am going to take this to the ombudsman. I am tired of MTN's bad service over the years. My contract for R129 and it should remain that way. I cannot afford an increase.