Late Billing

I purchased tyres on the 24th of October from Minty's tyres, I received an sms from Standard bank CONFIRMING that the cash had left my account and my statement reflected the the correct balance after the amount of R1877.99 was debited, somehow in between then and the 15th of November, the cash somehow came back into my account without my knowledge, I then receive an SMS on the 15th of November telling me that my standard bank account is overdrawn due to the purchase at Minty's tyres. How useless is this bank that they cannot even keep track of my money!!!!!!!!!!! I am safer leaving the cash under my mattress in all honesty. If You tell me that cash has left my account then I take that as the truth as you are my bank and the people we TRUST with our cash!!!!!!!!!!!!! I am not liable for any overdrawn balance on my account as it is your responsibility to ensure that my account is not overdrawn especially as I have NO OVERDRAW function activated, once I make a purchase, the cash should not come back to my account unless I ask you to do so and now you guys want to make it my issue!!!!!! NO WAY!!!!!!!!! Have this sorted out right now!!!!! I would NEVER recommend this bank to anyone, Rather stick to FNB!