MTN Worcester Mountain Mill service atrocious

My husband has been an MTN customer since the early 90s, therefore a loyal customer for more than 20 years. When he wanted to renew his contract a few weeks ago, the store assistants informed him that there were no Samsungs available, so he waited. Went back several times. Eventually, a phone was available, he had to go back to the store several times, because every time something was missing from his documentation, according to the store employees, yet every time he had asked if all was in order. Last weekend, when he went to collect the phone, they had sold it to someone else, even though the employee had my husband’s name and phone number on the box to keep it for him until the credit clearance went through. So he had to wait for new stock to arrive again. Today, he received a request from his bank for an enormous debit order request, which was not at all the price he had agreed to for the new contract. So not even did they have his documentation wrong, excuses about why they could not supply him with a new phone, but they also had a totally wrong debit order amount. He is thinking to leave MTN and going to another service provider. MTN’s service, especially this store’s employees, is abominable.