Markham Forensics is propably costing them Millions

Its been almost two years since I bought on my Markhams account, and ever since they must have lost out on atleast R50,000 worth of lost revenue from me, and possibly much more if many others have gone through what i have. I bought a laptop bag online which was advertised as a 17" bag. When it arrived it was in fact a 15". I duly went to the Due South store in Canal Walk and returned it. I tried purchasing again a few weeks later and was told that my account was blocked. Further to the embarrassment of this I enquired as to why, and they advised that there it was blocked as they had tried to phone me to confirm whether it was me and blocked my card due to me not answering. I advised them that i was on leave, and that surely they should have sms'd or emailed me first before just blocking my card. They stated that i need to provide my ID and answer a few "security" questions and my card would be unblocked. I duly obliged, however, the questions asked were the stupidest and most irrelevant, but i answered them all to the best of my knowledge. I was then told that i didn't get all the questions right, and i needed to come back with my green bar coded ID. All of this due to their incompetence and rashness in blocking my card prematurely. Over a year later i decide to support them again, and duly go in to the store to unblock my card. I phoned first and they told me to just bring in my ID and they will sort out. I travel all the way to the Tygervalley Mall Due South, and the store salesman advised me that he phoned the forensics department and they require a proof of address as well. I ask him if Edgars account is good enough and he confirms. I go to Edgars, get a stamped statement with address, and go back to Due South. The salesman emails it through and phones Forensics, who now tell him that the proof of address is not good enough, and that they need a proof of address on a bank statement. I am a professional and don't have time to waste like this. I think the service and competence especially from Markhams forensics department is the worst i have ever seen, and is probably costing Markhams loads of money in lost revenue and dissatisfied customers. I phone Customer Care after arriving home, and they cannot 100% tell me what documents i need to take in to unblock my account, and that Forensics are closed and i need to phone back in the morning. I am possibly not going to phone in the morning, and rather take my business to Edgars, Truworths and Woolworths who treat customers like they want their business.