Security Deposit issues

I lived in a 2 Bedroom Townhouse at VIISA Resources, Riverside Village and left back in December 14, 2015 when my contract ended. I attempted several times to contact the building admin to surrender the keys and finally we were able to set an appointment. However, on the said date the did not show and I was told over the phone that it is ok to surrender the keys to the guard. I did so in good faith. I left the unit in pretty good condition, residing in the unit for only 1 year. Only 1 wall in the living room had punctures due to my paintings and the same in the Masters Bedroom. 1 wall had holes. Aside from that the paint and the rest of the unit was left in good condition. I received an email from the Building Admin today after several follow ups that out of my Total 31k Deposit only 6k would be returned. The administrator informed me over the phone that they will paint the whole unit regardless of it's condition and they will charge me the following.. I don't mind for the stuff I really have to pay like utilities but they are scamming me out of my deposit? What are my legal options or steps I should take?

January 23, 2016
Mr. Roniel Destura
Dear Mr. Destura,
Re: RT Unit # 23, Riverside Executive Townhomes
We are sending herewith the list of items to be charged and deducted to your two (2) months
Security Deposits for Unit # 35 as follows:
I. REFUNDABLE DEPOSITS
A. Two (2) months Security Deposit: P13,050.00 x 2 months = P 26,100.00
B. Meralco Service Deposits 5,000.00
Total Refundable Deposits P 31,100.00
II. DEDUCTIONS:
A.) Repainting Cost:
1.) 4 gals Boysen Permacoat Semi-Gloss Latex P 2,648.80
Sunshine Yellow
2 gals Boysen Flatwall Enamel # 800 1,157.20
2 gals Boysen Quick Dry Enamel # 600 1,278.20
2 gals Boysen Samar Beige 1,190.20
1 gal Polyurethane floor varnish topcoat 1,046.10
1 liter Super Valspar Varnish 350.00
1 meter Sanding Paper #100 120.00
1 gal Paint Thinner 185.00
3 bottles Lacquer Thinner 90.00
2 kilos Patching Compound 60.00
1 kilo Cotton Waste 60.00
4 pcs. Sanding Paper # 180 48.00
1 liter Polituff Body Filler 210.00
1 pce. Roller Brush 7" w/ handle 90.00
1 pce. Paint Brush 1" 35.00
Total Material Costs P 8,568.50
Labor Cost: (2 men x 8 days) 7,680.00
Total Materials & Labor 16,248.50
B.) Utility Charges
1.) Meralco Bill for period Nov. 11 to Dec. 10, 2015 P 5,872.84
2.) Meralco Bill for period Dec. 11 to Dec. 14, 2015 334.64
3.) Manila Water Bill for period Nov. 21 to Dec.19, 2015 479.88
Total Utility Charges P 6,687.36
C. Other Charges
1.) Replacement of Damaged Laundry Door 2,076.00
Total Other Charges P 2,076.00
TOTAL AMOUNT TO BE DEDUCTED 25,011.86
TOTAL NET AMOUNT TO BE REFUNDED P 6,088.14
Thank you very much.

Very truly yours, Conforme:
Vivencio Golamco Mr. Roniel Destura
President
VIISA RESOURCES, INC.
Mezzanine Hotel 878, 878 E. Rodriguez Jr. Avenue, Bagumbayan, Quezon City
Telephone Nos. (632) 421-3785 to 86, Fax No. (632) 421-3785, Email: viisaresources@yahoo.com

They cannot charge you the repainting cost if not indicated in the contract. These things are not naturally chargeable since this means their capital outlay and not merely penalty for whatever damage you caused to the building. A little while will not require repainting of the entire room.