Debit order not deducted and getting phone calls from collection .

I'm being constantly phoned from nedbank call centre regarding a debit order that they did not collect . I've recently changed banks after receiving bad service or constantly charge for anything . My other debit orders went off from Nedbank , but still they haven't debited the last personal loan . Call centres is not picking up anything and I constantly need to remind them when my salary data is . And I've left money behind in my bank account for them to deduct . I've recently went to query at the Zevenwacht branch and I was told it was pending . I've received collection sms's and phone calls . I got paid Friday the 25th and today is Monday 28th where I made cash payment at pinelands nedbank at the tellers. Around after 6pm I was called again and the consultant told me there's no payment that's reflecting . Why must i run back and forth and still to get threating sms's. I am in process of purchasing a home . Should i find out that I'm going to be listed negatively I'm not going to very happy about it . I'm ****ed as I switched to nedbank for reasons of buying a house a year back . And I was declined . What service am I getting . I am very upset and I'm I will take it further.