Bad service

In January I paid my husband's Markham's account in full in April they started sending sms that I own them R133 and it must be paid immediately. I went to markhams cape gate and they put me through to head office cape town parow I spoke to nasheeta and she refused to give me her surname, and was rude and had no customer service skills the ref number is ***9f the call was made on monday at 17:55 I was charged for an email that was send to an email address the doesn't exist account benefits, credit insurance, which I never agreed on. This is very sad as I have been a loyal customer of markhams for more then 20 years and this is how you treat your customers.