Breach in Agreement

I was disappointed in the service from Discovery Insure and was about to move away. Their Retention division then apologised sympathetically for the service rendered and requested i give them a second chance, which i did. They also offered me a compensation for the troubles (R200 x 3months cash back). This was to run from Oct17 to Dec17. The first 2 months were honored but not the 3rd month. I followed up with retention, they again apologise and claimed it was a system error and it will be paid out the next month. Again, this did not materialise. I followed up again, they apologised again, this time offering a new compensation of R300 x 3 months. The same pattern repeated itself ( 2months payout, none on the 3rd month). I followed up in April, they apologised and said that it will pay out in May18. I was not pleased with this and was told that i did not earn this money so i should not complain when it gets paid out. Today, 21st May i am still not paid what was promised to me, and to be told that they will not pay this last R300 because i was already paid out last year. In my opinion, Discovery did not honor the first compensation, they made a new compensation agreement and still did not honor it. How can i trust such a company that does not honor their agreements. This is a terrible display of trust and customer service.