Auto & General poor service delivery -great at making promises and that's where it stays.

We paid our installments and we were promised a cash back bonus.They said in writing they would pay on 6 November ,no payment was made only after i asked about it they then move the date to 11 November ,what stops them from moving the dates again ?Also they have a policy where if they break a promise they pay the client R1000 ,00 they are also refusing to pay that .I wonder if they will even honor claims if they have a issue to pay out a small cash back bonus. This is clearly a breach of contract from this company.