My 78 year old fathe...

My 78 year old father inlaw who has been a loyal customer for over 20 years calls in to change his bank account nr as he has closed his account... only to get told his ID is incorrect.. last 2 digits. Very strange as he has done numerous upgrades and asked to produce ID each time. Call center asked him to go instore to correct it. Only then can they change banking details. 7th September we did so. Checked a week later and it's still not corrected. Hence debit will return again. Mtn logged a call and still not resolved. The customer is a cancer patient and can't be expected to go around fixing an error which us clearly on Mtn side. There are many customers having the same issue.