Customer service leaves a bad taste in my mouth

I am despondent and disappointed with my last few interactions with woolworths and have learnt a valuable lesson of checking my receipt at the till to avoid the frustration of having to deal with customer service or store managers the latter will be unavoidable as the amount of times the POS doesn't deduct the discounts is now seemingly in my experience unavoidable. This has been a general problem with woolworths and they have not been able to resolve this over the years. I am not going to give a point by point account of their shortcoming but there are many. About the customer service part. Call logged, complaint unresolved, time period 3 weeks 1 day. Complaint no ***. This was followed up 3 times of which there will be no fourth. After providing constructive feedback to the call center agent my expectation was for some clarity as it is both time consuming and inconvenient to go to shops to have mistakes rectified. There was one a call but call center staff should realize we have jobs and we are not waiting for calls rather if they miss a complaint they need to make a note and follow up. When discounts don't go off and the markup off the sale price is 40% more this is taking from other peoples monies, some people may call this *****ing. Anyway woolworths you are a disappointment.